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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.
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You need to return a free-able string.
I added an approproate note to the solution setup.
Also most likely not a kata issue.
for the LCM, both recursion and iteration would work; but i'm not sure why you think you'd need a hash table ?
No. No reason why you would need to.
Without your code, it is very difficult to help you, refer to the Troubleshooting guide about how to properly post it here.
mate you have to help us help you
saying
my code works perfectly but doesn't work heredoesn't give others anything to work with. you can post a snippet of your code(with spoiler flag) and ask for some specific help. or...you could try an easier kata, since g964's katas are usually quite tricky to understand if you are just starting outas usual, read this: https://docs.codewars.com/training/troubleshooting/
Read this: https://docs.codewars.com/training/troubleshooting#c-c-signal-11---sigsegv