Run clippy and use every fix (except return)

src/bin/problem_1.rs

@@ -1,20 +1,14 @@
 fn main() {
-    let result: i32 = (0..1000)
-        .into_iter()
-        .filter(|x| x % 3 == 0 || x % 5 == 0)
-        .sum();
+    let result: i32 = (0..1000).filter(|x| x % 3 == 0 || x % 5 == 0).sum();
 
-    println!("Result: {}", result);
+    println!("Result: {result}");
 }
 
 #[cfg(test)]
 mod tests {
     #[test]
     fn it_works() {
-        let result: i32 = (0..10)
-            .into_iter()
-            .filter(|x| x % 3 == 0 || x % 5 == 0)
-            .sum();
+        let result: i32 = (0..10).filter(|x| x % 3 == 0 || x % 5 == 0).sum();
         assert_eq!(result, 23);
     }
 }

src/bin/problem_2.rs

@@ -1,6 +1,6 @@
 fn main() {
     let result = fibonacci_even_sum(4_000_000);
-    println!("Result: {}", result);
+    println!("Result: {result}");
 }
 
 fn fibonacci_even_sum(limit: i64) -> i64 {

src/bin/problem_4.rs

@@ -1,6 +1,6 @@
 fn main() {
     let result = find_largest_palindrome(3);
-    println!("Result: {}", result);
+    println!("Result: {result}");
 }
 
 fn find_largest_palindrome(digits: u32) -> i64 {

src/bin/problem_5.rs

@@ -1,6 +1,6 @@
 fn main() {
     let result = square_of_sum(100) - sum_of_squares(100);
-    println!("Result: {}", result);
+    println!("Result: {result}");
 }
 
 fn square_of_sum(range: i64) -> i64 {

src/bin/problem_6.rs

@@ -1,6 +1,6 @@
 fn main() {
     let result = smallest_multiple(20);
-    println!("Result: {}", result);
+    println!("Result: {result}");
 }
 
 fn smallest_multiple(number: i64) -> i64 {

src/bin/problem_8.rs

@@ -2,7 +2,7 @@ const NUMBER: &str =  "731671765313306249192251196744265747423553491949349698352
 
 fn main() {
     let result = adjacent_product(NUMBER, 13);
-    println!("Result: {}", result);
+    println!("Result: {result}");
 }
 
 fn adjacent_product(number: &str, window: usize) -> i64 {