huh? 14 % 2 is not 2. izdwuut is right, it does not matter in this case.

Thank you Ivan, I fixed the image

I don't have this image in my browser cache( Probably somebody can share this image and I will upload this again, otherwise it will take some time while I will restore the image.
Guys, could you check you browser cache?

1^2 + 2^2 + 3^2 = 14 : (14 % 2) == 2
1^3 + 2^3 + 3^3 = 36 : (36 % 2) == 0
It metters...

This is not an issue with the Tests. Please recheck your code!
This is the test you mentioned cr_assert_str_eq(multiply("0000001", "3"), "3"); and has you can see, it expect "3" as your answer.

It couldn't, but it doesn't matter here, as it seems.