class Solution {
    static String revStr(String s) {
        String ans = "";
        for(int i = s.length()-1; i >= 0; i--) {
            ans += s.charAt(i);
        }
        return ans;
    }
}

I was solving a question to reverse a string and my output was correct, but it was taking longer than expected, and I can’t figure out how to optimise this code.