The function acronym is actually in Chapter 1 of the book, but don't look it up until you truly need a solution!
The function acronym takes a sentence as its input and returns a word that contains only the first letters of meaningful words:
> (acronym '(the united states of america)) 'usa > (acronym '(pacific gas and electric)) 'pge
Here are words that are not meaningful and should be discarded:
; if you can think of other boring words, feel free to add them (define boring-words '(a the an in of and or but for to with))
1. Write acronym using higher-order functions.
2. Write acronym using recursion.