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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 you are getting diamonds but failed just few tcs?
make sure you return null for even and Negative numbers also
I can print out a perfect diamond shape with * characters, but it says I failed.