Function reverse_prefix

2000-reverse-prefix-of-word.rs:18–30

(word: String, ch: char)

}

pub fn reverse_prefix(word: String, ch: char) -> String {
    let s_index = word.find(ch);
    match s_index {
        Some(p) => {
            let res = word.clone();
            let mut left = res[..p+1].chars().rev().collect::<String>();
            let right: String = res[p+1..].to_string();
            left.push_str(&right);
            left
        },
        None => word,
    }
}