May 7th, 2020 
The assignment is to complete 2 methods:
makeVariableLists – This method populates the vars and arrays lists with Variable and Array objects, respectively, for the simple variable and arrays that appear in the expression.
evaluate – This method evaluates the expression.
Everything else except for these 2 methods is already implemented and there is no need to modify it. The project includes all helper methods required, as well as 2 test files to make sure the program works. The details are in the PDF, please read carefully. I think using stacks is one of the recommended methods to go about this, in which case the stack class is already provided. If possible, please make comments within the code, thank you.
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