in ffi/primitives/primitives_library/primitives.c [10:21]
int main()
{
printf("3 + 5 = %d\n", sum(3, 5));
int *mult = multiply(3, 5);
printf("3 * 5 = %d\n", *mult);
free(mult);
int sub_num = 3;
printf("3 - 5 = %d\n", subtract(&sub_num, 5));
printf("1 + 2 + 3 + 4 + 5 + 6 = %d\n",
multi_sum(6, 1, 2, 3, 4, 5, 6));
return 0;
}