make solving the problem 1000 times not the default behaviour

day11/src/main.rs

@@ -144,7 +144,7 @@ fn main() {
     let mut sum1 = 0i64;
     let mut sum2 = 0i64;
     // Solve multiple times for performance testing
-    for _ in 0..1000 {
+    for _ in 0..1 {
         //(sum1, sum2) = naive_implementation(&input_str);
         (sum1, sum2) = improved_implementation(&input_str);
     }