You are given an n x n 2D matrix representing an image. Write a program to **rotate the image by 90 degrees** (clockwise).

**Problem Note **

- You have to rotate the image in-place, which means you have to modify the input 2D matrix directly.

**Example 1**

```
Input:
[
[1,2,3],
[4,5,6],
[7,8,9]
]
Output: Rotate the input matrix in-place such that it becomes:
[
[7,4,1],
[8,5,2],
[9,6,3]
]
```

**Example 2**

```
Input:
[
[ 5, 1, 9,11],
[ 2, 4, 8,10],
[13, 3, 6, 7],
[15,14,12,16]
]
Output: Rotate the input matrix in-place such that it becomes:
[
[15,13, 2, 5],
[14, 3, 4, 1],
[12, 6, 8, 9],
[16, 7,10,11]
]
```