Manipulate lists with fundamental higher-order list functions.
Write a procedure, (acronym string-of-words), that takes as input
a string of words separated by spaces and produces as output an
acronym that consists of the first letter of each word.
> (acronym "International Business Machines")
"IBM"
> (acronym "Grinnell's Underground Magazine")
"GUM"
> (acronym "Sam's Assorted Musings and Rants")
"SAMaR"
You may rely on this following helper function.
;;; (first-char str) -> character
;;; str: A non-empty string
;;; Extracts the first character of a string
(define first-char
(lambda (str)
(string-ref str 0)))
> (first-char "hello")
#\h
> (first-char "International")
#\I