ReverseVowels.java

package LeetcodePractice;
import java.util.Set;

public class ReverseVowels {
    public static String reverseVowels(String s) {
        Set<Character> vowels = Set.of('a','e','i','o','u','A','E','I','O','U');
        char[] chars = s.toCharArray();
        int left = 0, right = chars.length - 1;

        while (left < right) {
          
            while (left < right && !vowels.contains(chars[left])) left++;
            
            while (left < right && !vowels.contains(chars[right])) right--;

         
            char temp = chars[left];
            chars[left] = chars[right];
            chars[right] = temp;

            left++;
            right--;
        }

        return new String(chars);
    }

    public static void main(String[] args) {
        
        System.out.println(reverseVowels("IceCreAm"));
        System.out.println(reverseVowels("leetcode")); 
    }
    
}