pub fn length_of_last_word(string: String) -> i32 {
  string
    .split_whitespace()
    .last()
    .map(|word| word.len())
    .unwrap_or_default() as i32
}

#[test]
fn test_length_of_last_word() {
  assert_eq!(length_of_last_word("Hello World".to_string()), 5);
  assert_eq!(
    length_of_last_word("   fly me   to   the moon  ".to_string()),
    4
  );
  assert_eq!(length_of_last_word("luffy is still joyboy".to_string()), 6);
}