[racket] Use of map and eval to evaluate symbol in namespace

Hello everyone -

First of all, a big Thank You to all of you and for taking the time for
responding.

I'll have to set aside sometime during this weekend to see if I can
understand the ideas you've been so kind to offer.

However, I should confess that I've made some progress with way simpler
stuff which I hope to post later on.  Like I've said, this is stupid
software. Anyways, none of this is final.

It really just used a plain text solution, since the format if a recipe is
so rigid. The question of expanding the symbols from files to run-time was
easier than I thought.

The idea of using modules might have the nice collateral effect if some
sort of primitive type (or syntax) checking for free. I like the idea
someone offered of using modules for medication definitions. Actually, one
module per definition makes it very easy for future users to add new
medications. The ease of syntax is important because it allows for the
customization by non-sophisticated users (physicians, nurses).

Cheers,
Henry Lenzi.
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