How to make C functions like printf or user made functions highlighted in Vim?

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vim-cpp-modern

5 541 4.8 Vim Script

Extended Vim syntax highlighting for C and C++ (C++11/14/17/20/23)

I personally just use vim-cpp-modern because it supports C and C++ and highlights most things well. I've also tweaked it to highlight identifiers in most situations (so far it's correct for everything except C++ templates).

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