diff --git a/Cargo.lock b/Cargo.lock
index fb0624c..cf569c8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,7 +1,15 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "project_euler"
 version = "0.1.0"
+dependencies = [
+ "utils",
+]
+
+[[package]]
+name = "utils"
+version = "0.1.0"
+source = "git+https://git.plobos.xyz/projects/PuzzleUtils.git#d3a93a875f56c8f865411c0b7437986f413ca524"
diff --git a/Cargo.toml b/Cargo.toml
index dfe5f6c..caf82fe 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,3 +6,4 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+utils = { git = "https://git.plobos.xyz/projects/PuzzleUtils.git" }
diff --git a/src/bin/problem_12.rs b/src/bin/problem_12.rs
index 709c60e..923113b 100644
--- a/src/bin/problem_12.rs
+++ b/src/bin/problem_12.rs
@@ -23,7 +23,7 @@ fn get_divisors(n: usize) -> Vec<usize> {
             divisors.push(potential_divisor);
             divisors.push(n / potential_divisor);
         }
-        potential_divisor = potential_divisor + 1;
+        potential_divisor += 1;
     }
     // This almost made me go mad
     if potential_divisor * potential_divisor == n {
diff --git a/src/bin/problem_13.rs b/src/bin/problem_13.rs
index 4709c97..579040a 100644
--- a/src/bin/problem_13.rs
+++ b/src/bin/problem_13.rs
@@ -1,4 +1,4 @@
-use project_euler::number::Number;
+use utils::number::Number;
 
 fn main() {
     let mut sum = Number::from(0);
diff --git a/src/bin/problem_15.rs b/src/bin/problem_15.rs
index fd403aa..7dcc1f0 100644
--- a/src/bin/problem_15.rs
+++ b/src/bin/problem_15.rs
@@ -1,4 +1,4 @@
-use project_euler::number::Number;
+use utils::number::Number;
 
 fn main() {
     let width = Number::from(20);
diff --git a/src/bin/problem_16.rs b/src/bin/problem_16.rs
index 80b28cd..9578cfc 100644
--- a/src/bin/problem_16.rs
+++ b/src/bin/problem_16.rs
@@ -1,4 +1,4 @@
-use project_euler::number::Number;
+use utils::number::Number;
 
 fn main() {
     let power = get_power(1000);
diff --git a/src/bin/problem_17.rs b/src/bin/problem_17.rs
index 012ac4d..031b76a 100644
--- a/src/bin/problem_17.rs
+++ b/src/bin/problem_17.rs
@@ -1,4 +1,4 @@
-use project_euler::number::Number;
+use utils::number::Number;
 
 fn main() {
     let mut num_letters = 0;
diff --git a/src/bin/problem_2.rs b/src/bin/problem_2.rs
index 47d1171..eb17bdb 100644
--- a/src/bin/problem_2.rs
+++ b/src/bin/problem_2.rs
@@ -14,7 +14,7 @@ fn fibonacci_even_sum(limit: i64) -> i64 {
         }
     }
 
-    return sum;
+    sum
 }
 
 #[cfg(test)]
diff --git a/src/bin/problem_20.rs b/src/bin/problem_20.rs
index 90de773..ab526b7 100644
--- a/src/bin/problem_20.rs
+++ b/src/bin/problem_20.rs
@@ -1,4 +1,4 @@
-use project_euler::number::Number;
+use utils::number::Number;
 
 fn main() {
     let factorial = get_factorial(100);
diff --git a/src/bin/problem_21.rs b/src/bin/problem_21.rs
index 8c62888..2347fa5 100644
--- a/src/bin/problem_21.rs
+++ b/src/bin/problem_21.rs
@@ -9,10 +9,10 @@ fn main() {
     for i in 2..10000 {
         let divisors = get_divisors(i);
         let sum_divisors = divisors.iter().sum();
-        if amicable_cache.get(&sum_divisors).is_some() {
+        if amicable_cache.contains_key(&sum_divisors) {
             continue;
         }
-        if despicable_cache.get(&sum_divisors).is_some() {
+        if despicable_cache.contains_key(&sum_divisors) {
             continue;
         }
         let other_divisors = get_divisors(sum_divisors);
@@ -37,7 +37,7 @@ fn get_divisors(n: isize) -> Vec<isize> {
             divisors.insert(potential_divisor);
             divisors.insert(n / potential_divisor);
         }
-        potential_divisor = potential_divisor + 1;
+        potential_divisor += 1;
     }
-    divisors.iter().map(|&divisor| divisor).collect()
+    divisors.iter().copied().collect()
 }
diff --git a/src/bin/problem_23.rs b/src/bin/problem_23.rs
index 0d082c5..b71f186 100644
--- a/src/bin/problem_23.rs
+++ b/src/bin/problem_23.rs
@@ -14,12 +14,9 @@ fn main() {
         }
         let mut contained = false;
         for abundant in &abundants {
-            match abundants.binary_search(&(num - abundant)) {
-                Ok(_) => {
-                    contained = true;
-                    break;
-                }
-                Err(_) => {}
+            if abundants.binary_search(&(num - abundant)).is_ok() {
+                contained = true;
+                break;
             }
         }
         if !contained {
@@ -54,7 +51,7 @@ fn get_divisors(n: usize) -> Vec<usize> {
             divisors.push(potential_divisor);
             divisors.push(n / potential_divisor);
         }
-        potential_divisor = potential_divisor + 1;
+        potential_divisor += 1;
     }
     // This almost made me go mad, should have used the one from 21
     if potential_divisor * potential_divisor == n {
diff --git a/src/bin/problem_24.rs b/src/bin/problem_24.rs
index cdc14ac..25514cd 100644
--- a/src/bin/problem_24.rs
+++ b/src/bin/problem_24.rs
@@ -1,9 +1,9 @@
-use std::error::Error;
+use utils::permutation::nth_lex;
 
 fn main() {
     let n = 1_000_000;
     let digits = vec![1, 0, 2, 3, 4, 5, 6, 7, 8, 9];
-    let perm = permutation(digits, n)
+    let perm = nth_lex(digits, n)
         .expect("Should return ok")
         .iter()
         .map(|&digit| digit.to_string())
@@ -12,55 +12,14 @@ fn main() {
     println!("{perm}");
     let digits = vec!["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"];
     //for n in 1..=factorial(digits.len()) {
-    let perm = permutation(digits.clone(), n)
+    let perm = nth_lex(digits.clone(), n)
         .expect("Should return ok")
         .join("");
     println!("{perm}");
     //}
     let digits = vec!["a", "b", "c", "d", "e", "f", "g", "h", "i", "j"];
-    let perm = permutation(digits.clone(), n)
+    let perm = nth_lex(digits.clone(), n)
         .expect("Should return ok")
         .join("");
     println!("{perm}");
 }
-
-/// Explanation
-///
-/// there are 10! possible permutations
-/// for each first number there are 9!, for each first 2 numbers 8!, etc.
-/// we check how many times we have 9! permutations before we're over 1_000_000
-/// aka. 1000000 / 9!
-/// we take the remainder and check how many times we have 8! before we?re over it
-/// (1000000 % 9!) 8!
-/// etc.
-/// every iteration we remove the digit by the idx from the original permutation
-/// we only check for 999999 permutations because we already have the first one
-///
-fn permutation<T: Copy + Ord>(mut digits: Vec<T>, nth: usize) -> Result<Vec<T>, Box<dyn Error>> {
-    digits.sort();
-    if nth == 1 {
-        return Ok(digits);
-    }
-    if nth > factorial(digits.len()) || nth == 0 {
-        return Err(Box::from("Out of bounds"));
-    }
-    let mut perm = Vec::new();
-    let num_unique_digits = digits.len();
-    let mut remainder = nth - 1;
-    for idx in 1..=digits.len() {
-        let permutations = remainder / factorial(num_unique_digits - idx);
-        remainder = remainder % factorial(num_unique_digits - idx);
-        perm.push(digits[permutations]);
-        digits.remove(permutations);
-    }
-    Ok(perm)
-}
-
-// number of permutations is n! where n is the number of digits
-fn factorial(num: usize) -> usize {
-    let mut fact = 1;
-    for n in 1..=num {
-        fact = fact * n;
-    }
-    fact
-}
diff --git a/src/bin/problem_25.rs b/src/bin/problem_25.rs
index 28b84dd..9bbf34e 100644
--- a/src/bin/problem_25.rs
+++ b/src/bin/problem_25.rs
@@ -1,67 +1,17 @@
-use project_euler::number::Number;
+use utils::number::Number;
 
 fn main() {
     let fib_idx = find_fib(1000);
     println!("{fib_idx}");
 }
 
-// Way too slow, from 20 onward we go from µs to ms and from 32 we measure in seconds
-//fn fib_recursion(n: Number) -> usize {
-//    let one = Number::from(1);
-//    if n == one {
-//        return 1;
-//    }
-//    let two = Number::from(2);
-//    if n == two {
-//        return 1;
-//    }
-//    fib_recursion(n.clone() - two) + fib_recursion(n - one)
-//}
-
-// almost as fast as the no recursion solution but more complicated and more memory intensiv
-// creating an inner function to not have to pass in the hashmap from outside makes it slightly slower
-//fn fib_recursion_cached(n: Number) -> Number {
-//    let mut cache: HashMap<Number, Number> = HashMap::new();
-//    fn inner_fib_recursion_cached(n: Number, cache: &mut HashMap<Number, Number>) -> Number {
-//        let one = Number::from(1);
-//        if n == one {
-//            return one;
-//        }
-//        let two = Number::from(2);
-//        if n == two {
-//            return one;
-//        }
-//        match cache.get(&n) {
-//            Some(res) => return res.clone(),
-//            None => {
-//                let res = inner_fib_recursion_cached(n.clone() - two, cache) + inner_fib_recursion_cached(n.clone() - one, cache);
-//                cache.insert(n.clone(), res.clone());
-//                return res;
-//            },
-//        }
-//    }
-//    inner_fib_recursion_cached(n, &mut cache)
-//}
-
-// faster than recursion
-fn fib(n: usize) -> Number {
-    let mut last_two = (Number::from(1), Number::from(1));
-    let mut iteration = 1;
-    while iteration < n {
-        last_two = (last_two.1.clone(), last_two.0 + last_two.1);
-        iteration += 1;
-    }
-
-    last_two.0
-}
-
 fn find_fib(num_digits: usize) -> usize {
     let mut n = 1;
     loop {
-        let fib = fib(n);
+        let fib = Number::fib(n);
         let fib_len = fib.digits.len();
         if fib_len == num_digits {
-            return n;
+            return n as usize;
         }
         n += 1;
     }
diff --git a/src/bin/problem_28.rs b/src/bin/problem_28.rs
index 6bd0b96..78e5439 100644
--- a/src/bin/problem_28.rs
+++ b/src/bin/problem_28.rs
@@ -13,7 +13,7 @@ fn main() {
         for corner in 0..4 {
             sum += last_square_end + (square * 2) * (corner + 1);
         }
-        last_square_end = last_square_end + (square * 2) * 4;
+        last_square_end += (square * 2) * 4;
     }
     println!("{sum}");
 }
diff --git a/src/bin/problem_29.rs b/src/bin/problem_29.rs
index 354fbdc..9fce235 100644
--- a/src/bin/problem_29.rs
+++ b/src/bin/problem_29.rs
@@ -1,6 +1,7 @@
-use project_euler::number::Number;
 use std::collections::HashSet;
 
+use utils::number::Number;
+
 fn main() {
     let mut terms: HashSet<Number> = HashSet::new();
     let max = 100;
diff --git a/src/bin/problem_3.rs b/src/bin/problem_3.rs
index 1a0859d..a3592ef 100644
--- a/src/bin/problem_3.rs
+++ b/src/bin/problem_3.rs
@@ -1,34 +1,6 @@
+use utils::math::prime_factors;
+
 fn main() {
     let result = prime_factors(600851475143).into_iter().max();
     println!("Result: {}", result.unwrap());
 }
-
-fn prime_factors(number: i64) -> Vec<i64> {
-    let mut factors = vec![2];
-    let upper: i64 = (number as f64).sqrt().ceil() as i64;
-    for i in 3..upper {
-        let mut is_prime = true;
-        for factor in &factors {
-            if i % factor == 0 {
-                is_prime = false;
-                break;
-            }
-        }
-        if is_prime && number % i == 0 {
-            factors.push(i);
-        }
-    }
-
-    return factors;
-}
-
-#[cfg(test)]
-mod tests {
-    use crate::prime_factors;
-
-    #[test]
-    fn it_works() {
-        let result = prime_factors(13195).into_iter().max();
-        assert_eq!(result.unwrap(), 29);
-    }
-}
diff --git a/src/bin/problem_30.rs b/src/bin/problem_30.rs
index 6d95907..6fa00f8 100644
--- a/src/bin/problem_30.rs
+++ b/src/bin/problem_30.rs
@@ -1,4 +1,4 @@
-use project_euler::number::Number;
+use utils::number::Number;
 
 fn main() {
     println!("{}", nth_powers(5))
@@ -11,7 +11,7 @@ fn nth_powers(nth: u32) -> isize {
     loop {
         let attempt = max * idx;
         if Number::from(attempt).digits.len() < idx as usize {
-            max = (idx - 1) * max;
+            max *= idx - 1;
             break;
         }
         idx += 1;
diff --git a/src/bin/problem_34.rs b/src/bin/problem_34.rs
index 19898cf..48d3305 100644
--- a/src/bin/problem_34.rs
+++ b/src/bin/problem_34.rs
@@ -1,26 +1,18 @@
-use project_euler::number::Number;
+use utils::{math::factorial, number::Number};
 
 fn main() {
     let factorials_sum = digit_factorials();
     println!("{factorials_sum}");
 }
 
-fn factorial(num: isize) -> isize {
-    let mut fact = 1;
-    for n in 1..=num {
-        fact = fact * n;
-    }
-    fact
-}
-
 fn digit_factorials() -> isize {
     let mut factorials = vec![];
-    let mut max = factorial(9);
+    let mut max = factorial(9) as isize;
     let mut idx = 1;
     loop {
         let attempt = max * idx;
         if Number::from(attempt).digits.len() < idx as usize {
-            max = (idx - 1) * max;
+            max *= idx - 1;
             break;
         }
         idx += 1;
@@ -29,7 +21,7 @@ fn digit_factorials() -> isize {
         let digits_fact_sum = Number::from(n)
             .digits
             .iter()
-            .map(|&digit| factorial(digit))
+            .map(|&digit| factorial(digit as u64) as isize)
             .sum();
         if n == digits_fact_sum {
             factorials.push(n);
diff --git a/src/bin/problem_4.rs b/src/bin/problem_4.rs
index c7c98e1..c86d560 100644
--- a/src/bin/problem_4.rs
+++ b/src/bin/problem_4.rs
@@ -16,7 +16,7 @@ fn find_largest_palindrome(digits: u32) -> i64 {
         }
     }
 
-    return largest;
+    largest
 }
 
 fn check_palindrome(number: i64) -> bool {
@@ -27,7 +27,7 @@ fn check_palindrome(number: i64) -> bool {
             return false;
         }
     }
-    return true;
+    true
 }
 
 #[cfg(test)]
diff --git a/src/bin/problem_48.rs b/src/bin/problem_48.rs
index fcfdd52..a3c4e3d 100644
--- a/src/bin/problem_48.rs
+++ b/src/bin/problem_48.rs
@@ -1,4 +1,4 @@
-use project_euler::number::Number;
+use utils::number::Number;
 
 fn main() {
     println!("{}", power_series(1000));
diff --git a/src/bin/problem_50.rs b/src/bin/problem_50.rs
index 46dc38d..c1a307d 100644
--- a/src/bin/problem_50.rs
+++ b/src/bin/problem_50.rs
@@ -24,7 +24,7 @@ fn solve() -> usize {
     let mut chain_length = primes.len() - 1;
     loop {
         for prime_window in primes.windows(chain_length) {
-            let sum = prime_window.iter().map(|&prime| prime).sum::<usize>();
+            let sum = prime_window.iter().copied().sum::<usize>();
             if primes.contains(&sum) {
                 return sum;
             }
diff --git a/src/bin/problem_6.rs b/src/bin/problem_6.rs
index d5c1376..40e7968 100644
--- a/src/bin/problem_6.rs
+++ b/src/bin/problem_6.rs
@@ -1,17 +1,19 @@
+use utils::math::factorial;
+
 fn main() {
     let result = smallest_multiple(20);
     println!("Result: {result}");
 }
 
 fn smallest_multiple(number: i64) -> i64 {
-    let factorial = factorial(number);
+    let factorial = factorial(number.try_into().unwrap()) as i64;
     for i in number..=factorial {
         if is_multiple(i, number) {
             return i;
         }
     }
 
-    return factorial;
+    factorial
 }
 
 fn is_multiple(number: i64, range: i64) -> bool {
@@ -23,14 +25,6 @@ fn is_multiple(number: i64, range: i64) -> bool {
     true
 }
 
-fn factorial(n: i64) -> i64 {
-    let mut result = 1;
-    for i in 1..=n {
-        result *= i;
-    }
-    return result;
-}
-
 #[cfg(test)]
 mod tests {
     use crate::smallest_multiple;
diff --git a/src/bin/problem_7.rs b/src/bin/problem_7.rs
index fda6206..01823f4 100644
--- a/src/bin/problem_7.rs
+++ b/src/bin/problem_7.rs
@@ -1,30 +1,10 @@
+use utils::math::nth_prime;
+
 fn main() {
     let result = nth_prime(10001);
     println!("Result: {}", result.unwrap());
 }
 
-fn nth_prime(nth: i64) -> Option<i64> {
-    let mut primes: Vec<i64> = vec![2];
-
-    let mut i = 3;
-
-    while primes.len() < nth as usize {
-        let mut is_prime = true;
-        for prime in &primes {
-            if i % prime == 0 {
-                is_prime = false;
-                break;
-            }
-        }
-        if is_prime {
-            primes.push(i);
-        }
-        i += 1;
-    }
-
-    return primes.pop();
-}
-
 #[cfg(test)]
 mod tests {
     use crate::nth_prime;
diff --git a/src/bin/problem_8.rs b/src/bin/problem_8.rs
index 9f0e519..44e81e9 100644
--- a/src/bin/problem_8.rs
+++ b/src/bin/problem_8.rs
@@ -19,7 +19,7 @@ fn adjacent_product(number: &str, window: usize) -> i64 {
         .max()
         .unwrap();
 
-    return result;
+    result
 }
 
 #[cfg(test)]
diff --git a/src/bin/problem_9.rs b/src/bin/problem_9.rs
index 67ae407..cf7b307 100644
--- a/src/bin/problem_9.rs
+++ b/src/bin/problem_9.rs
@@ -14,5 +14,5 @@ fn main() {
 }
 
 fn is_triplet(a: usize, b: usize, c: usize) -> bool {
-    return a * a + b * b == c * c;
+    a * a + b * b == c * c
 }
diff --git a/src/lib.rs b/src/lib.rs
deleted file mode 100644
index 67eb8f6..0000000
--- a/src/lib.rs
+++ /dev/null
@@ -1,414 +0,0 @@
-pub mod number {
-    use std::cmp::{min, Ordering};
-    use std::fmt::{Display, Formatter};
-    use std::iter::zip;
-    use std::ops::{Add, Div, Mul, Rem, Sub};
-
-    #[derive(Clone, Debug, Eq, PartialEq, Hash)]
-    pub enum Sign {
-        Positif,
-        Negatif,
-    }
-
-    #[derive(Clone, Debug, Eq, PartialEq, Hash)]
-    pub struct Number {
-        pub digits: Vec<isize>,
-        pub sign: Sign,
-    }
-
-    impl Number {
-        pub fn get_digit(n: isize, pos: usize) -> isize {
-            let modulo = 10isize.pow(pos as u32 + 1);
-            let divisor = modulo / 10;
-            (n % modulo) / divisor
-        }
-
-        pub const fn byte_to_digit(b: u8) -> isize {
-            // wrapping_sub('0' as u32) same as - 48 but less magical
-            (b as isize).wrapping_sub('0' as isize)
-        }
-
-        pub fn handle_overflows(&mut self) {
-            let new_digits = &mut self.digits;
-            let digits_len = new_digits.len();
-            let mut digits_idx = digits_len - 1;
-            loop {
-                let digit_or_num = new_digits[digits_idx];
-                let digit_len = if digit_or_num != 0 {
-                    (digit_or_num.abs() as f64 + 1.0).log10().ceil() as usize
-                } else {
-                    1
-                };
-                for i in 0..digit_len {
-                    let new_digit = Self::get_digit(digit_or_num, i);
-                    let (digit_idx, is_overflow) = digits_idx.overflowing_sub(i);
-                    if is_overflow {
-                        new_digits.insert(0, new_digit);
-                        digits_idx += 1;
-                    } else {
-                        let digit = new_digits.get_mut(digit_idx).unwrap();
-                        if i == 0 {
-                            *digit = new_digit;
-                        } else {
-                            *digit += new_digit;
-                        }
-                    }
-                }
-                if digits_idx == 0 {
-                    break;
-                }
-                digits_idx -= 1;
-            }
-        }
-
-        pub fn handle_underflows(&mut self) {
-            let new_digits = &mut self.digits;
-            let mut digits_len = new_digits.len();
-            for digit in new_digits.clone() {
-                match digit.cmp(&0) {
-                    Ordering::Equal => {
-                        if digits_len == 1 {
-                            return;
-                        }
-                        digits_len -= 1;
-                        new_digits.remove(0);
-                    }
-                    Ordering::Less => {
-                        self.sign = Sign::Negatif;
-                        break;
-                    }
-                    _ => break,
-                };
-            }
-            let mut digits_idx = digits_len - 1;
-            loop {
-                let digit = new_digits[digits_idx];
-                if self.sign == Sign::Positif && digit < 0 && digits_idx > 0 {
-                    let mut_digit = new_digits.get_mut(digits_idx).unwrap();
-                    *mut_digit = 10 - digit.abs();
-                    let mut_digit = new_digits.get_mut(digits_idx - 1).unwrap();
-                    *mut_digit -= 1;
-                } else {
-                    let mut_digit = new_digits.get_mut(digits_idx).unwrap();
-                    *mut_digit = digit.abs();
-                }
-                if digits_idx == 0 {
-                    break;
-                }
-                digits_idx -= 1;
-            }
-            for digit in new_digits.clone() {
-                match digit.cmp(&0) {
-                    Ordering::Equal => {
-                        new_digits.remove(0);
-                    }
-                    _ => break,
-                };
-            }
-        }
-
-        pub fn pow(self, n: u32) -> Self {
-            let mut result = self.clone();
-            if ((self.digits.len() * 8) as u32) < isize::BITS {
-                let number = isize::from(self);
-                for _i in 1..n {
-                    result = result * number;
-                }
-                result
-            } else {
-                let number = self.clone();
-                for _i in 1..n {
-                    result = result * number.clone();
-                }
-                result
-            }
-        }
-
-        pub fn fact(self) -> Self {
-            let mut fact = Number::from(1);
-            if ((self.digits.len() * 8) as u32) < isize::BITS {
-                let max = isize::from(self);
-                for n in 1..=max {
-                    fact = fact * n;
-                }
-                fact
-            } else {
-                panic!("starting number too big")
-            }
-        }
-
-        fn div_with_rem(n1: Number, n2: Number) -> (Number, Number) {
-            let n1_len = n1.digits.len();
-            let n2_len = n2.digits.len();
-            if n2_len > n1_len {
-                return (Number::from(0), n2);
-            }
-            let dividend = n1.digits[..n2_len].to_vec();
-            let mut quotient = vec![];
-            let mut remainder = Number {
-                digits: dividend.clone(),
-                sign: Sign::Positif,
-            };
-            let mut iteration = 1;
-            loop {
-                let mut factor = 0;
-                loop {
-                    let temp_remainder = remainder.clone() - n2.clone();
-                    if temp_remainder.sign == Sign::Negatif {
-                        quotient.push(factor);
-                        break;
-                    }
-                    remainder = temp_remainder;
-                    factor += 1;
-                }
-                if n1_len == n2_len + iteration - 1 {
-                    break;
-                }
-                remainder.digits.push(n1.digits[n2_len + iteration - 1]);
-                iteration += 1;
-            }
-            let mut res = Number {
-                digits: quotient,
-                sign: Sign::Positif,
-            };
-            res.handle_overflows();
-            for digit in res.clone().digits {
-                if digit != 0 {
-                    break;
-                }
-                res.digits.remove(0);
-            }
-            for digit in remainder.clone().digits {
-                if digit != 0 || remainder.digits.len() == 1 {
-                    break;
-                }
-                remainder.digits.remove(0);
-            }
-            (res, remainder)
-        }
-    }
-
-    impl From<Number> for isize {
-        fn from(value: Number) -> Self {
-            let mut num = 0;
-            for (pos, &digit) in value.digits.iter().rev().enumerate() {
-                num += digit * 10isize.pow(pos as u32);
-            }
-            num
-        }
-    }
-
-    impl From<Number> for String {
-        fn from(value: Number) -> Self {
-            let string_vec: Vec<String> = value
-                .digits
-                .iter()
-                .map(|&digit| digit.to_string())
-                .collect();
-            string_vec.concat()
-        }
-    }
-
-    impl From<&str> for Number {
-        fn from(value: &str) -> Self {
-            let bytes = value.as_bytes();
-            let (sign, idx_start) = match bytes[0] {
-                b'-' => (Sign::Negatif, 1),
-                _ => (Sign::Positif, 0),
-            };
-            let mut digits = vec![];
-            for &byte in &bytes[idx_start..] {
-                let digit = Self::byte_to_digit(byte);
-                digits.push(digit);
-            }
-            Self { digits, sign }
-        }
-    }
-
-    impl From<isize> for Number {
-        fn from(value: isize) -> Self {
-            let mut sign = Sign::Positif;
-            if value < 0 {
-                sign = Sign::Negatif;
-            }
-            let num_len = if value > 0 {
-                (value as f64 + 1.0).log10().ceil() as usize
-            } else {
-                1
-            };
-            let mut digits = vec![];
-            for digit_idx in 0..num_len {
-                let digit = Self::get_digit(value, digit_idx);
-                digits.push(digit);
-            }
-            let digits = digits.iter().rev().copied().collect();
-            Self { digits, sign }
-        }
-    }
-
-    impl Display for Number {
-        fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-            let number_string = self
-                .digits
-                .iter()
-                .map(|&digit| digit.to_string())
-                .collect::<Vec<String>>()
-                .join("");
-            match self.sign {
-                Sign::Positif => write!(f, "{number_string}"),
-                Sign::Negatif => write!(f, "-{number_string}"),
-            }
-        }
-    }
-
-    impl Add for Number {
-        type Output = Self;
-
-        fn add(self, rhs: Self) -> Self::Output {
-            let self_len = self.digits.len();
-            let rhs_len = rhs.digits.len();
-            let mut self_digits = self.digits.clone();
-            let mut rhs_digits = rhs.digits.clone();
-            if self_len != rhs_len {
-                let difference = (self_len).abs_diff(rhs_len);
-                let pad = vec![0isize; difference];
-                if min(self_len, rhs_len) == self_len {
-                    self_digits = [pad, self.digits].concat();
-                } else {
-                    rhs_digits = [pad, rhs.digits].concat();
-                }
-            }
-            let zipped = zip(self_digits.iter(), rhs_digits.iter());
-            let added = zipped
-                .map(|(self_digit, rhs_digit)| self_digit + rhs_digit)
-                .collect();
-            let mut overflown_number = Self {
-                digits: added,
-                sign: Sign::Positif,
-            };
-            overflown_number.handle_overflows();
-            overflown_number
-        }
-    }
-
-    impl Sub for Number {
-        type Output = Self;
-
-        fn sub(self, rhs: Self) -> Self::Output {
-            let self_len = self.digits.len();
-            let rhs_len = rhs.digits.len();
-            let mut self_digits = self.digits.clone();
-            let mut rhs_digits = rhs.digits.clone();
-            if self_len != rhs_len {
-                let difference = (self_len).abs_diff(rhs_len);
-                let pad = vec![0isize; difference];
-                if min(self_len, rhs_len) == self_len {
-                    self_digits = [pad, self.digits].concat();
-                } else {
-                    rhs_digits = [pad, rhs.digits].concat();
-                }
-            }
-            let zipped = zip(self_digits.iter(), rhs_digits.iter());
-            let added = zipped
-                .map(|(self_digit, rhs_digit)| self_digit - rhs_digit)
-                .collect();
-            let mut underflown_number = Self {
-                digits: added,
-                sign: Sign::Positif,
-            };
-            underflown_number.handle_underflows();
-            underflown_number
-        }
-    }
-
-    impl Mul for Number {
-        type Output = Self;
-
-        fn mul(self, rhs: Self) -> Self::Output {
-            let multiplied = self.digits.iter().rev().enumerate().map(|(pos, &digit)| {
-                let mut mult = digit * rhs.clone();
-                mult.digits = [mult.digits, vec![0; pos]].concat();
-                mult
-            });
-            let mut overflown_number = multiplied.reduce(|acc, num| acc + num).unwrap();
-            overflown_number.handle_overflows();
-            overflown_number
-        }
-    }
-
-    impl Mul<Number> for isize {
-        type Output = Number;
-
-        fn mul(self, rhs: Number) -> Self::Output {
-            let multiplied = rhs.digits.iter().map(|digit| digit * self).collect();
-            let mut overflown_number = Number {
-                digits: multiplied,
-                sign: Sign::Positif,
-            };
-            overflown_number.handle_overflows();
-            overflown_number
-        }
-    }
-
-    impl Mul<isize> for Number {
-        type Output = Self;
-
-        fn mul(self, rhs: isize) -> Self::Output {
-            let multiplied = self.digits.iter().map(|digit| digit * rhs).collect();
-            let mut overflown_number = Self {
-                digits: multiplied,
-                sign: Sign::Positif,
-            };
-            overflown_number.handle_overflows();
-            overflown_number
-        }
-    }
-
-    impl Div for Number {
-        type Output = Self;
-
-        fn div(self, rhs: Self) -> Self::Output {
-            Self::div_with_rem(self, rhs).0
-        }
-    }
-
-    impl Rem for Number {
-        type Output = Self;
-
-        fn rem(self, rhs: Self) -> Self::Output {
-            Self::div_with_rem(self, rhs).1
-        }
-    }
-
-    #[cfg(test)]
-    mod number_tests {
-        use crate::number::{Number, Sign};
-
-        #[test]
-        fn test_from_isize() {
-            let number = Number::from(-1234);
-            assert_eq!(
-                number,
-                Number {
-                    digits: vec![1234],
-                    sign: Sign::Negatif
-                }
-            );
-        }
-
-        #[test]
-        fn test_get_digit() {
-            let num = 12345;
-            let digit_1 = Number::get_digit(num, 0);
-            let digit_2 = Number::get_digit(num, 1);
-            let digit_3 = Number::get_digit(num, 2);
-            let digit_4 = Number::get_digit(num, 3);
-            let digit_5 = Number::get_digit(num, 4);
-            assert_eq!(digit_1, 5);
-            assert_eq!(digit_2, 4);
-            assert_eq!(digit_3, 3);
-            assert_eq!(digit_4, 2);
-            assert_eq!(digit_5, 1);
-        }
-    }
-}