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#![allow(dead_code)]
pub fn reverse_string(s: &mut Vec<char>) {
if s.len() < 2 {
return;
}
let mut i = 0;
let mut j = s.len() - 1;
while i < j {
s.swap(i, j);
i += 1;
j -= 1;
}
}
pub fn reverse_string2(s: &mut Vec<char>) {
s.reverse();
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test1() {
let mut s = vec!['h', 'e', 'l', 'l', 'o'];
reverse_string(&mut s);
assert_eq!(s, vec!['o', 'l', 'l', 'e', 'h']);
}
#[test]
fn test2() {
let mut s = vec!['h', 'e', 'l', 'l', 'o'];
reverse_string2(&mut s);
assert_eq!(s, vec!['o', 'l', 'l', 'e', 'h']);
}
}