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public class Solution {
    public String reverseString(String s) {
        if(s == null || s.length() < 2) return s;
        int i = 0;
        int j = s.length() - 1;
        char[] str = s.toCharArray();
        while (i < j) {
            char temp = str[i];
            str[i] = str[j];
            str[j] = temp;
            i++;
            j--;
        }
        return new String(str);
    }
}