Fix Insert() and Remove()

[Banaanae]

Still needs:

• Fix Key-Value pairs
• Handling vars (a var will fail IsDigit())
• Handling cases that don't match if statements
• Lots of warnings _;-;

[mmikeww]

Feel free to take initiatives on things like this. Having the suite of tests allows experimentation because you can easily see if you introduce any regressions that would break other functionality. As long as tests pass, incremental additions should be fine

[Banaanae]

Right, the warnings only show when converting Insert and Remove so should be fine for now