[LeetCode] Reverse String - Two-pointer

class Solution {
    public void reverseString(char[] s) {
        int i = 0;
        int j = s.length - 1;        
        
        while(i < j) {
            char tmp = s[j];
            s[j] = s[i];
            s[i] = tmp;
            i++;
            j--;            
        }
    }
}