int** multiplyMatrices(int** matrix1, int** matrix2, int rows, int columns, int rows2, int columns2)
{
    int **mult, sum = 0;
    mult = new int *[rows];
    for (int i = 0; i < rows; i++)
        mult[i] = new int[columns2];
    for (int i = 0; i < rows; i++)
    {

        for (int k = 0; k < columns2; k++)
        {
            for (int j = 0; j < columns; j++)
            {
                sum += (matrix1[i][j] * matrix2[j][k]);
            }
            mult[i][k] = sum;
            sum = 0;
        }
    }

    return mult;


}