Reverse String
Difficulty: Easy
Category: DSA
Topics: Two Pointers, String
Asked at: Apple, Microsoft, Goldman Sachs, Amazon, Adobe, Bloomberg
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 <= 105`
- `s[i]` is a printable ascii character.