escape string into a C style string litteral (pasteable in C code)

[Timothee Cour via Digitalmars-d-learn]

Is there an existing way to do it or do I have to roll my own?
unittest{
  assert(escapeC(`a"bc\ndef`~"\n") == `"a\"bc\\ndef\n"`);
}

Likewise with escapeD (pastable in D code), which would return something
like: `r"..."` for more readability
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