/**
 * Split a string based on an iterator
 */
func split_iter(str: string) -> vec<string> {
    mut res = vec<string>::new();
    mut tmp = string::new(); /* Or `mut tmp = "";` */

    for c in str.chars() {
        if c == ' ' {
            if tmp.len() > 0 {
                res.push_back(tmp);
            }
        } else {
            tmp.append(letter);
        }
    }

    res
}

/**
 * Split a string based on an index
 */
func split_idx(str: string) -> vec<string> {
    mut res = vec<string>::new();
    mut tmp = string::new(); /* Or `mut tmp = "";` */

    for i in 0..str.len() {
        letter = str.at(i);
        if letter.is_none() {
            break;
        } else {
            if letter == ' ' {
                if tmp.len() > 0 {
                    res.push_back(tmp);
                }
            } else {
                tmp.append(letter);
            }
        }
    }

    res
}