#1 Bug in count_n ?

If one calls count_n(0) wouldn't the result be 0? Shouldn't there be a check at the beginning of the function like

pub fn count_n(mut n: i32) -> i32 {
// count the digits in the number
  if n == 0 {
    return 1;
  }
  let mut count = 0;
  if n <0 {
    n=n*-1
  }
  while n>0 {
    n=n/10;
    count = count +1;
  }
  count
}

I fix it THNX for you