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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.
Thx for taking the time to leave a comment and enlighten me :-)
One problem with this solution - appending to new_s is not perfectly optimal, because strings in Python are immutable and every time you need to reallocate memory when adding next char or ' ' to new_s.