int main(void)
{
    int rows = 2;
    int cols = 5;
    int **arrayy = malloc(sizeof(int*) * rows);
    for (int i = 0 ; i < rows ; i++) {
        int *line = malloc(sizeof(int) * cols);
        for (int j = 0 ; j < cols ; j++) {
            line[j] = i;
        }
        arrayy[i] = line;
    }

    int n = array_2d_sum(arrayy, rows, cols);
    printf("n = %d\n", n);
}