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struct Solution;
impl Solution {
pub fn reverse_vowels(s: String) -> String {
let (mut i, mut j) = (0, s.len().checked_sub(1).unwrap_or(0));
let mut cs = s.chars().collect::<Vec<char>>();
while i < j {
if !Self::is_vowel(cs[i].to_ascii_lowercase()) {
i += 1;
continue
}
if !Self::is_vowel(cs[j].to_ascii_lowercase()) {
j -= 1;
continue
}
cs.swap(i, j);
i += 1;
j -= 1;
}
cs.iter().collect()
}
fn is_vowel(c: char) -> bool {
match c {
'a' | 'e' | 'i' | 'o' | 'u' => true,
_ => false
}
}
}
fn main() {
let s = "hello".to_string();
print!("{}", Solution::reverse_vowels(s));
}
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