test.rs

fn main() {


   fn something(array: &mut Vec<i32>)  {
      let mut length = array.len();
      let mut swapped;

      while length != 0 {
          swapped = 0;

          for index in 1..length {
            if array[index] == -1 {
               array.swap(index -1, index);
               swapped = index;
            }
          }

          length = swapped;
      }

   }


   let mut some_arr = vec![1,1,1,1,1,-1,-1,-1,1,-1];
   something(& mut some_arr);

   println!("{:?}", some_arr);
   // [-1, -1, -1, -1, 1, 1, 1, 1, 1, 1]
}