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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've solved the JS version, there are no punctuation symbols in tests.
There are no tests with non-letter/digit characters. Some of solutions wouldn't pass tests if there was, say, an exclamation mark in the string.