Cassidoo move zeroes solution :3

move_zeroes.rs

fn move_zeroes(arr: &mut Vec<i32>) -> Vec<i32> {
    arr.sort_by_key(|n: &i32| n == &0);
    arr.to_vec()
}

// How to use it:
fn main() {
    let mut xs: Vec<i32> = vec![1, 0, 0, 5, 3, 0];
    move_zeroes(&mut xs);
    println!("{:?}", xs);
}