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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.
Great! Thanks for the feedback!
There is no test with "aettsT!ih ssi". As you can see this string is not in the test cases.
This error says: You decrypted the text to "aettsT!ih ssi" and not to "This is a test!"
The problem is in your code.
Could you paste your code here? (Mark as spoiler!)