#2 easy strings

Reverse a String

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

You must do this by modifying the input array in-place with O(1) extra memory.

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 <= 10^5 s[i] is a printable ASCII character.

Hint 1: Use two pointers — one at the start, one at the end — and swap them moving inward.

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