236 pub fn levenshtein(a: &str, b: &str) -> usize {  in levenshtein()  function
256     1.0 - (levenshtein(a, b) as f64) / (a.chars().count().max(b.chars().count()) as f64)  in normalized_levenshtein()
695         assert_eq!(0, levenshtein("", ""));  in levenshtein_empty()
700         assert_eq!(0, levenshtein("levenshtein", "levenshtein"));  in levenshtein_same()
705         assert_eq!(3, levenshtein("kitten", "sitting"));  in levenshtein_diff_short()
710         assert_eq!(5, levenshtein("hello, world", "bye, world"));  in levenshtein_diff_with_space()
715         assert_eq!(3, levenshtein("öঙ香", "abc"));  in levenshtein_diff_multibyte()
716         assert_eq!(3, levenshtein("abc", "öঙ香"));  in levenshtein_diff_multibyte()
723         assert_eq!(37, levenshtein(a, b));  in levenshtein_diff_longer()
728         assert_eq!(7, levenshtein("", "sitting"));  in levenshtein_first_empty()
733         assert_eq!(6, levenshtein("kitten", ""));  in levenshtein_second_empty()