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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.
While you do have a good point, I personally think this is a good Kata to train your data manipulation skills. Precisely, finding and replacing string. Be as creative as you can to write the database without typing them all one by one.
You can. There's nothing holding you back from use of StringBuilder or ArrayList.