Refactor code

[reacto11mecha]

This pull request is just refactoring code and a little bit of a change. I think we should refactor the code before getting bigger and more complicated. It provides better readability and maintainability.

[RioChndr]

Thank your for refactor this project.🤩🤩 Love it

[RioChndr]

I got error when run this command

> node jaksel-interpreter.js example/example2.jaksel 
undefined:5
let isHidup = positive vibes;
                       ^^^^^

SyntaxError: Unexpected identifier

Looks like function valueTransform failed to transform boolean value

[reacto11mecha]

Okay i will fix it after school, thank you for detecting this problem

[reacto11mecha]

I have fixed this problem, now it should be working as intended

[RioChndr]

thank you so much for your hard working. This is very usefull