itr_index.rs

fn yay(left: &str) {
    for (idx, c) in left.char_indices() {
      println!("{} {}", idx, c);
    }
}

fn main() {
    yay("hello !!! こんにちは！");
}

output.txt

[aaron@higgins rustfun]$ ./hello
0 h
1 e
2 l
3 l
4 o
5  
6 !
7 !
8 !
9  
10 こ
13 ん
16 に
19 ち
22 は
25 ！