Solution 6

src/bin/problem_6.rs

@@ -0,0 +1,43 @@
+fn main() {
+    let result = smallest_multiple(20);
+    println!("Result: {}", result);
+}
+
+fn smallest_multiple(number: i64) -> i64 {
+    let factorial = factorial(number);
+    for i in number..=factorial {
+        if is_multiple(i, number) {
+            return i;
+        }
+    }
+
+    return factorial;
+}
+
+fn is_multiple(number: i64, range: i64) -> bool {
+    for i in 2..=range {
+        if number % i != 0 {
+            return false;
+        }
+    }
+    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;
+
+    #[test]
+    fn it_works() {
+        let result = smallest_multiple(10);
+        assert_eq!(result, 2520);
+    }
+}