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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.
Instructions say "Consider only uppercase letters (no lowercase letters, no numbers) and spaces". One of the C tests includes already leet speak, which is not "only uppercase letters and spaces":
The expression !strcmp (toLeetSpeak (strdup ("!@#$%^&*JUMPS!()[];';<>,.")), "!@#$%^&*JUMP$!()[];';<>,.") is false.