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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.
issue not reproducible with the OP's C# code
it looks like the random tests in C# now include large numbers that dont fit in 64-bit integers
issue not reproducible with the OP's C# submission (which has an incorrect method name but otherwises passes)
looks like C# sample tests were added at some point
the first part is a duplicate of this issue (no sample tests in C#). the second part is not actionable as kata ranks cannot be changed
duplicate of this issue
duplicate of this issue
duplicate of this issue
you do not allocate enough memory - you are lacking 1 byte for the nul-terminator. in the future, please ask a question instead of raising an issue.
c -- random test triggers error: 'free(): invalid pointer', i cannot recreate this with the same values, the value being returned should always be a valid pointer as the returned value is created from malloc, and then never directly touched, just the data inside.