Implemented the nullary/unary call operators
tree543733ea0527f42698a23b16a9e492a8ed9c5dd3
drwxr-xr-x - fridh
-rw-r--r-- 1220 function.cpp
drwxr-xr-x - intermediary
drwxr-xr-x - interpreter
drwxr-xr-x - lexer
-rw-r--r-- 682 main.cpp
-rw-r--r-- 1377 symbol.cpp
drwxr-xr-x - variable