Rotate Image

def rotate(matrix):
    l, r = 0, len(matrix) - 1
    
    while l < r:
        for i in range(r - l):
            top, bottom = l, r
            
            # save the topleft
            topLeft = matrix[top][l + i]
            
            # move bottom left into top left
            matrix[top][l + i] = matrix[bottom - i][l]
            
            # move bottom right into bottom left
            matrix[bottom - i][l] = matrix[bottom][r - i]
            
            # move top right into bottom right
            matrix[bottom][r - i] = matrix[top + i][r]
            
            # move top left into top right
            matrix[top + i][r] = topLeft
            
        r -= 1
        l += 1