String-equal is a Common Lisp function. See any Common Lisp
documentation for more information.
Major Section: PROGRAMMING
For strings str1 and str2, (string-equal str1 str2) is true if
and only str1 and str2 are the same except perhaps for the cases of
their characters.
The guard on string-equal requires that its arguments are strings
consisting of standard characters (see standard-char-listp).
String-equal is a Common Lisp function. See any Common Lisp
documentation for more information.