344. Reverse String

Write a function that reverses a string. The input string is given as an array of characters char[].

Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.

You may assume all the characters consist of printable ascii characters.

Example 1:

1 2	Input: ["h","e","l","l","o"] Output: ["o","l","l","e","h"]

Example 2:

1 2	Input: ["H","a","n","n","a","h"] Output: ["h","a","n","n","a","H"]

好久沒看到這麼平易近人的題目了(淚)，就是反轉字串，感謝python又拯救了工程師的一天。

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