Not all Swift code can directly be made available to C – or rather via C to other ecosystems that allow FFI (foreign function interfaces) from C libraries. The key is twofold: The following is based on this Gist by Julian Kirsch : https://gist.github.com/HiImJulien/c79f07a8a619431b88ea33cca51de787
During the time between Christmas and New Year, which we tend to call the time “between the years” where I live in Germany, I wanted to do something fun, but not too fun so I don’t get spoiled. That’s how I turned up experimenting to use libMultiMarkdown from within a Swift app. The amount of fun I have when reading and writing C code is negligible, which made it a perfect fit.