;;;; Copyright (c) 2013 Robert Smith
-;;;; Exercise: Given a string such as "abc def", reverse the words,
-;;;; delimited by spaces, in the string in place.
+;;;; Exercise: Reverse the letters of words, delimited by spaces, in a
+;;;; Example: "Hello my name is: Bob." ==> "olleH ym eman :si .boB"
(defun reverse-substring! (string start end)
"Reverse the substring of characters in the string STRING from the
;;;; Exercise: Reverse the order of words in a sentence.
+;;;; Example: "Hello my name is: Bob." ==> "Bob. is: name my Hello"
(defun reverse-sentence (string)
"Reverse the order of the words in the sentence STRING."