/* Return the index of the first space or s.len()*/
fn get_word_index(s: &str) -> usize {
    let bytes = s.as_bytes();

    for (i, &item) in bytes.iter().enumerate() {
        if item == b' ' {
            return i;
        }
    }

    return s.len();
}

fn first_word(s: &str) -> &str {
    let idx = get_word_index(s);

    return &s[..idx];
}

fn main() {
    let s = String::from("corno manso ronaldo curintiano");
    let slice = first_word(&s);

    println!("{slice}");
}