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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.
Add the null case to your test code. Otherwise you teach how to write bad code.
Clever but slow, unreadable and ugly as hell at the same time. Sorry guys, I've checked several solutions and not even one checks if the received string is null. This code is an example of how not to code.