I believe the last sprintf call will write 0 outside of the allocated buffer.

It's added at first, but then removed by replacing the space char with 0.

Null-terminator for the resulting string. '\0' should be equivalent to 0 in this case.

Non-zero would be considered a valid pointer by the client code.

It shows me my version as deprecated and your one as approved. I suppose this is how it should be.

You may fork it if you want, although I'm not sure if there is any value in this attempt.

Apparently I can't reject my own translation, so I'll be grateful if someone rejected this for me.

Hello!
This is an abandoned attempt. I should probably delete it.

Haskell translation

Couldn't figure out how to make regex work in Haskell. I hope it doesn't really matter if solution isn't exactly "translated".