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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.
Not sure what your code is, but Xormias is saying that the kata requires you to build a return statement within the function as opposed to printing out the result to the terminal. Additionally many challenges may actually fail if you leave print statements in them due to the way they are built to be checked.
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You have to return the result, not just print it.
However it's not an issue (= a bug in the kata).
I have. Still, nothing.
Read this: https://docs.codewars.com/training/troubleshooting/
failing the tests despite the code running well with different use cases outside of CodeWars