message: A little more correct.
diff: use std::cmp;
  pub fn lev_distance(me: &str, t: &str) -> usize {
  + let t_len = t.chars().count();
  if me.is_empty() {
  - return t.chars().count();
  + return t_len;
  }
  if t.is_empty() {
  return me.chars().count();
  }
  - let mut dcol = (0..=t.len()).collect::<Vec<_>>();
  + let mut dcol = (0..=t_len).collect::<Vec<_>>();
  let mut t_last = 0;
  for (i, sc) in me.chars().enumerate() {
  