* remove functions which mages cannot interpret and add in functions which mages can
* set validResult when the result is explicitly created to differentiate it form an empty CalculateResult
* Add condition to check that the input is not ending with a binary operation
* add tests for all the cases
* use valid result while calculating hash as well
* add test for e is valid within regex
* removed i from regex
* remove valid result to use decimal? instead
* remove duplicate rand and exp
* Refactored logic and made it unit testable
* Changes after code review
* Added to build steps, and modified bracket to new class with unittest. Validates complexer cases now.
Co-authored-by: p-storm <paul.de.man@gmail.com>
