chrfrasco

    let target_chars: Vec<char> = target.chars().collect();
    for (i, source_char) in source.chars().enumerate() {
        let mut next_dist = i + 1;

        for (j, target_char) in target_chars.iter().enumerate()  {

    cache := make([]int, len(targetChars)+1)
    for i := 0; i < len(targetChars)+1; i++ {
        cache[i] = i
    }