reverte uma string com runas
// Reverse a string with runes
fn main() {
let r: String = "一二三四五六七八九十".chars().rev().collect();
println!("original {:?}", "一二三四五六七八九十");
println!("reverse r = {:?}", "一二三四五六七八九十");
assert_eq!(r, "十九八七六五四三二一");
}
Mackerel