Nice try, Special Agent Hnp.

You mean RPL? There are lots of interpreters for that already. That’s the sort of thing to write because you want to write it, not because other people want it, unless you’re part of a community that is asking for it.

If you just want to implement an interpreter because language implementation interests you, I suggest Lisp or Scheme rather than something like RPL. The book “Structure and Interpretation of Computer Programs” explains how to do that and it is great. You can read it online at mitpress.mit.edu/sicp .