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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.
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what is broken is your code; and the tests do free your returned string
some mistakes that i see :
str(n)caton an uninitialized bufferYou need to make sure you use "return" not "print"
You can still use it like this. And anyway, there's nothing unfair about it! ;)