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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.
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Closing due to lack of evidence of a bug in the kata.
You say
if the character is ""
, which isn't so much a character, but an empty string.The first test for invalid strings is exactly this, and it expects
false
, nottrue
.So, I don't see any issue with the kata here. Can you explain further?