344. Reverse String Java Solutions

Write a function that takes a string as input and returns the string reversed.

Example:
Given s = "hello", return "olleh".

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public class Solution {
    public String reverseString(String s) {
        if(s == null || s.length() <=1) return s;
        StringBuffer res = new StringBuffer(s.length());
        for(int i = s.length()-1;i >=0 ;i--){
            res.append(s.charAt(i));
        }
        return res.toString();
    }
}