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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 think your generateTextFromLines() is really inefficient because it creates a new String with every iteration of the loop. Using StringBuilder would be better. I used String.join().