Rotate Image at Amazon

Problem Description

You are given an `n x n` 2D `matrix` representing an image, rotate the image by **90** degrees (clockwise). You have to rotate the image [**in-place**](<https://en.wikipedia.org/wiki/In-place_algorithm>), which means you have to modify the input 2D matrix directly. **DO NOT** allocate another 2D ma...

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