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Challenge Points: 20

Level: Medium

Given an n x n list of lists (a square matrix), turn it 90 degrees clockwise.
The rotation must be done in-place, meaning you must update the same matrix—no extra matrix allowed.

Example 1:

Input: matrix = [[1,2,3], [4,5,6], [7,8,9]]

Output: [[7,4,1], [8,5,2], [9,6,3]]

Example 2:

Input: matrix = [[5,1,9,11], [2,4,8,10], [13,3,6,7], [15,14,12,16]]

Output: [[15,13,2,5], [14,3,4,1], [12,6,8,9], [16,7,10,11]]

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