I am writing a book that also has its own language called Erksar, the language was once a simple modified caesar crypto where I map vocal with another vocal (as a software engineer, it was pretty easy to create translator for it). “I love you” would become “E rufa tu” (it should be “E rufa tui” but I modified the result and tried to remove unnecessary letter). Now that I lost the original character map, some new word…
> where I map vocal with another vocal
I think you mean “vowel”, not “vocal”.