0344. Reverse String

https://leetcode.com/problems/reverse-string

Description

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

Example 1:

**Input:** s = ["h","e","l","l","o"]
**Output:** ["o","l","l","e","h"]

Example 2:

**Input:** s = ["H","a","n","n","a","h"]
**Output:** ["h","a","n","n","a","H"]

Constraints:

• 1 <= s.length <= 105

• s[i] is a printable ascii character.

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

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