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/**
 * https://leetcode.cn/problems/reverse-string/
 * 
 *  s 
 * 
 *  O(1) 
 * 
 *  1
 * s = ["h","e","l","l","o"]
 * ["o","l","l","e","h"]
 * 
 *  2
 * s = ["H","a","n","n","a","h"]
 * ["h","a","n","n","a","H"]
 * 
 * 
 * 1
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