Add support for and and or to your interpreter by modifying mceval.rkt$.$

Your implementation should be based on Section $4\mathrm{.}2\mathrm{.}1$ of the R$5$RS standard. The standard includes a short $($four sentence$),$ English description of how and and or expressions must be evaluated. Your goal is to translate each English specification into a recursive function. Pay careful attention to how the arguments to and and or are evaluated, recall what $$true$$ and $$false$$ values are, and make sure you evaluate each subexpression at most once.

You will probably want to use the last$-$exp?, first$-$exp, and rest$-$exps helper functions.