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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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Oh, didn't know that about the calloc, thank you for pointing this out!
result[size] = '\0'; is not needed as calloc nullifies the allocated memory.
function isupper() could be used instead of string[index] >= 'A' && string[index] <= 'Z'.
Nice solution though
I'm surprised to see
strrev()
in the solution worked, since strrev is not standard!