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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.
It is a case, just not one they tested for apparently, the specification says a string with just whitespace should return an empty space
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That's potentially a lotta allocation
num==0 should return 1 whoops
Why would you call concat on top of tostring?
C tester passes const * to free and free expects void*, so test fails