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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.
Could you elaborate on that? As far as I can see, the else statement is needed so that if no nextWord is given then it must be the end of the string and the function should put a period at the end.