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Additionally, I presume that this is a subset of C? If not, C cannot really be expressed as an LL(1) grammar. LL(k) is possible, and here is an example in ANTLR - https://github.com/antlr/grammars-v4/blob/master/c/C.g4. In fact, this syntax is close enough to BNF that you could probably read it to understand how to tweak to your usecase (again, assuming a subset of C).
As an aside, you might also find this series useful - https://github.com/DoctorWkt/acwj/blob/master/00_Introduction/Readme.md You can skip the code and simply read through the markdown files to get an idea of the whole journey, possibly saving you many deadends along your own journey.