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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.
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Yes it is. You renamed the function. Change it back to that. Not a kata issue, use Question label next time.
In file included from main.cpp:7:
./tests.cpp:5:19: error: use of undeclared identifier 'digital_root'
Assert::That(digital_root(16), Equals(7));