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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.
you could replace the last few lines with:
return b.length() == 0
right, there is also "getOrDefault" method - may be worth to consider.
you should consider using StringBuilder when editing String in a loop.