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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 did the same thing but didn't think to update the argument within the definition of the for loop.
Honestly, I never considered just replacing occurrences of 'T' in the argument with 'U', but I guess that would be more efficient than the method I used. I turned the argument into a character array using toCharArray() and added each character to a new string unless it was theh character 'T' in which case I added 'U'. You gotta work smarter not harder though.