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

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

SRE实战 互联网时代守护先锋，助力企业售后服务体系运筹帷幄！一键直达领取阿里云限量特价优惠。 class Solution {     public String reverseString(String s) {         char[] ch = s.toCharArray();         int start = 0;         int end = s.length() - 1;         while (start < end) {             char temp = ch[start];             ch[start] = ch[end];             ch[end] = temp;             start++;             end--;         }         return new String(ch);     } }
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