Function stringmetrics::try_levenshtein

pub fn try_levenshtein(a: &str, b: &str, limit: u32) -> Option<u32>

The same alrogithm as levenshtein_limit but return an Option to indicate if the limit is exceeded

use stringmetrics::try_levenshtein;

let a = "abcdefg";
let b = "mmmmmmmmm";
assert_eq!(try_levenshtein(a, b, 3), None);