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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.
this is how i would normally do it however since the problem specifically said not to convert it to string inorder to reverse. i would suggest syroen approach.