* Lisp Interpreter
using lex and yacc

** Resources:
+ [[https://github.com/AdhamAfis/yacc-parser-tutorial][yacc-parser-tutorial]]
+ [[https://en.wikipedia.org/wiki/S-expression][s-expressions]]
+ [[https://www.bowaggoner.com/writeups/jumpstart/flexbison/jumpstart_flexbison.pdf?utm_source][flex / bison jumpstart]]