Exam Rank 2- Exercise lcm.c

[selcyilm]

At first i tried with my solution:

After i did the grademe it failed me like this:

Than i searched the solution on google and try with that one:

But it was giving the same failure:

The function itself takes two unsigned integer, maybe when the test tried with '-1' it is giving some kind of undefined value therefore it fails. Maybe i did something wrong but wanted to share :D