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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.
If your function type changes in C you'd better rewrite your code however. What if it becomes a string? There is a problem to solve, with specifications, makes no sense to assume if whatever could happen.
Why do you want it to change?