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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.
I just found that if I simply return None, then for the tests which have a solution it would return like that. I think maybe the error msg should be changed so that it would not make us so confusing.
for some tests, I got "Solution is not a string" and "Test Passed" at the same time and for otehr tests it works normally. Can anyone tell me why this happened?
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