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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Your code doesn't even compile on Clang 3.6 which is used here.
It's a bug in your code, not in my kata. I am closing your issue.
As of today, 30 people were able to solve it using C language.
If you use something what is not supported by C used by CW then it will fail.
But most likely, it is some issue in your code, you can paste your code in the comment and mark it with a spoiler flag. Maybe somebody will be able to verfiy it for you.
Please don't report issues without providing details.