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// 言語処理 100本ノック http://www.cl.ecei.tohoku.ac.jp/nlp100/#ch1

fn main() {
    knock_3("パトカー", "タクシー");
    knock_2();
    knock_1();
}

fn knock_3(s1: &str, s2: &str){
    println!("{}", s1);
    println!("{}", s2);
}

fn knock_2(){
    let s = "パタトクカシーー";
    let mut ss1 = "".to_string();
    let mut ss2 = "".to_string();
    for (i, v) in s.chars().enumerate() {
        match i {
            0 => ss1 = ss1 + &v.to_string(),
            1 => ss2 = ss2 + &v.to_string(),
            2 => ss1 = ss1 + &v.to_string(),
            3 => ss2 = ss2 + &v.to_string(),
            4 => ss1 = ss1 + &v.to_string(),
            5 => ss2 = ss2 + &v.to_string(),
            6 => ss1 = ss1 + &v.to_string(),
            7 => ss2 = ss2 + &v.to_string(),
            _ => ss1 = ss1 + &v.to_string()
        }
    }
    println!("{}", ss1);
    println!("{}", ss2);
}

fn knock_1(){
    let s= "stressed";
    let mut ss: String = "".to_string();
    for r in s.chars().rev() {
        ss = ss + &r.to_string();
    }
    println!("{}", ss);
}