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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.
Unusual to include the '\0' in the length (11) passed?
No need for another Caesar's cypher.
See:
https://www.codewars.com/kata/rot13
https://www.codewars.com/kata/rot13-1
https://www.codewars.com/kata/rot13-2
and many others.
Duplicate. Or rather quadruplicate:
https://www.codewars.com/kata/rot13
https://www.codewars.com/kata/rot13-1
https://www.codewars.com/kata/rot13-2
FYI - Spelt
Caesar
not Ceasar