0048-rotate-image.c

void rotate(int** matrix, int matrixSize, int* matrixColSize){
    int left = 0;
    int right = matrixSize - 1;
    
    while (left < right) {
        for (int i = 0; i < right - left; i++) {
            int top = left;
            int bottom = right;
            
            // save the topLeft
            int topLeft = matrix[top][left + i];
            
            // move bottom left into top left
            matrix[top][left + i] = matrix[bottom - i][left];

            // move bottom right into bottom left
            matrix[bottom - i][left] = matrix[bottom][right - i];

            // move top right into bottom right
            matrix[bottom][right - i] = matrix[top + i][right];

            // move top left into top right
            matrix[top + i][right] = topLeft;
        }
        right -= 1;
        left += 1;
    }
}