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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.
Pardon me, You're correct.
There is something wrong with the test cases that include 's' or 'S'.
's', after 13 positions shift, should equal 'h' instead of 'f'.
Analogously, 'S' should equal 'H' instead of 'F'.