How can I replace (") by (')

You need to use to_charlist when dealing with Erlang libs…

Strings (written with ") and charlists (written with ') are different things. There’s a good introduction in the docs.

String.replace is still going to return a string - the quotes are not part of the value, they are how the value is written literally.

System.get_env expects a string, not a charlist, so it gives you an error if you write System.get_env('VOSK_MODEL')

You need to convert the string value returned from System.get_env into a charlist for the :vosk library - the String.to_charlist/1 function is a good choice for this.

you are correct, thank you very much

thank you very much for the help it helped me a lot

the problem solved I’m left something like this:

   env = System.get_env("VOSK_MODEL")
      c_path = String.to_charlist(env)
      model = :vosk.model_new(c_path)

This would be the Elixir way to write the same code…

model = "VOSK_MODEL"
|> System.get_env()
|> String.to_charlist()
|> :vosk.model_new()