fn appendAndDelete(s: &str, t: &str, k: i32) -> String {
    let s_len = s.len() as i32;
    let t_len = t.len() as i32;
    let common_len = s.chars().zip(t.chars()).take_while(|a| a.0 == a.1).count() as i32;
    let min_operations = (s_len - common_len) + (t_len - common_len);

    if min_operations > k {
        return "No".into();
    } else if (k - min_operations) % 2 == 0 {
        return "Yes".into();
    } else if k >= s_len + t_len {
        return "Yes".into();
    } else {
        return "No".into();
    }
}