Unlike all the more complicated languages the "freestanding" mode C doesn't even have a memcpy feature, so it may not define how one works - maybe you've decide

Unlike all the more complicated languages the "freestanding" mode C doesn't even have a memcpy feature, so it may not define how one works - maybe you've decided to use the name "memcpy" for your function which generates a memorandum about large South American rodents, and "memo_capybara" was too much typing. In something like C++ or Rust, even their bare metal "What do you mean Operating System?" modes quietly require memcpy and so on because we're not savages, clearly somebody should provide a way to copy bytes of memory, Rust is so civilised that even on bare metal (in Rust's "core" library) you get a working sort_unstable() for your arbitrary slice types!