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eval: significantly reduced complexity of tokenizer
minor changes
changed the structure of eval; the operator is found in eval, and then the tokens are found in tokenizer, and then the appropriate operation is performed
Restructured conditional statements in eval
corrected README
calculator.rs: Added a line in preparation for the help function
starting to work on help messages
eval: changed to work with help
fixed a semantic error
deleted some whitespace
added mroe help messages
fixed trig's cosine error
moar help