## Just another interpretation of typesetting
## TODO
 - [v] apply - 240403
 - [v] letrec - 240403
 - [v] car - 240403
 - [ ] cdr and cons
 - [ ] concat string (++)
 - [ ] create pdf
 - [ ] close pdf
 - [ ] add character
 - [ ] add path
 - [ ] basic typesetting format