static void matrixRotation(List<List<int>> matrix, int r)
{
    int rowsC = matrix.Count;
    int colsC = matrix[0].Count;


    int rm = 0;
    int rM = rowsC - 1;

    int cm = 0;
    int cM = colsC - 1;

    int length = (cM - cm + 1) * 2 + (rM - rm + 1) * 2 - 4;
   
    int[] a = new int[length];

    // Check if there is something to shift
    while (cm < cM && rm < rM)
    {
        int shifts = r % length;

        // Fill array from matrix part given by min/max row/column
        for (int i = cm; i <= cM; i++)
        {
            a[i - cm] = matrix[rm][i];
            a[cM - cm + rM - rm + i - cm] = matrix[rM][cM - i + cm];
        }

        for (int j = rm + 1; j <= rM - 1; j++)
        {
            a[cM - cm + j - (rm + 1) + 1] = matrix[j][cM];
            a[cM - cm + rM - rm + cM - cm + j - rm] = matrix[rM - 1 + rm + 1 - j][cm];
        }

        // Shift array
        for (int i = 0; i < length / 2; i++)
        {
            (a[i], a[length - 1 - i]) = (a[length - 1 - i], a[i]);
        }

        for (int i = 0; i < (length - shifts) / 2; i++)
        {
            (a[i], a[length - shifts - 1 - i]) = (a[length - shifts - 1 - i], a[i]);
        }

        for (int i = 0; i < shifts / 2; i++)
        {
            (a[length - shifts + i], a[length - 1 - i]) = (a[length - 1 - i], a[length - shifts + i]);
        }

        // Update matrix part given by min/max row/column from shifted array
        for (int i = cm; i <= cM; i++)
        {
            matrix[rm][i] = a[i - cm];
            matrix[rM][cM - i + cm] = a[cM - cm + rM - rm + i - cm];
        }

        for (int j = rm + 1; j <= rM - 1; j++)
        {
            matrix[j][cM] = a[cM - cm + j - (rm + 1) + 1];
            matrix[rM - 1 + rm + 1 - j][cm] = a[cM - cm + rM - rm + cM - cm + j - rm];
        }

        // Switch matrix part given by min/max row/column to the next level
        rm += 1;
        rM -= 1;
        cm += 1;
        cM -= 1;

        length -= 8;
    }

    foreach (var t in matrix)
    {
        foreach (var t1 in t) Console.Write($"{t1} ");
        Console.WriteLine();
    }
}