OK, so you want a function:

parseCall: String ->  String

that takes a string parses it, calls the respective FriCAS function and
returns the result as a string?

1) I separate the two stages.  parseCall  prepares everything for applying
    the needed standard function who's name is parsed at the top.
    The remaining stage is simpler.

2) First, a string is broken to  lexemes :  LexList ==>  List String.
I am going to try the format

Sergei,

1) You give ParseCallRes as a return type. But isn't it true that in the end you want to have a string that you can send back to Haskell?

2) Can you upload your code to your account on github and give me a link to it. That would make it easier for me to see the development of your code and enable me to propose some changes directly to your code.

Ralf

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