From 7c6a9b5f456235662f95b2f2d0e75058e94af1c6 Mon Sep 17 00:00:00 2001
From: Colin Okay <cbeok@protonmail.com>
Date: Thu, 13 Aug 2020 12:59:09 -0500
Subject: updated example

---
 examples.lisp | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/examples.lisp b/examples.lisp
index 973ebee..cba556a 100644
--- a/examples.lisp
+++ b/examples.lisp
@@ -5,10 +5,11 @@
 
 ;; http://rosettacode.org/wiki/Luhn_test_of_credit_card_numbers 
 (defun luhn (n)
-  (flet ((sum-dig (x) (if (> x 9) (- x 9) x)))
-    (>> n #'reverse
-        #$(map 'list #'digit-char-p $char)
-        #$(mapcar #'*
+  (>> n #'reverse
+      #$(map 'list #'digit-char-p $char)
+      #$(mapcar #'*
                 (loop :for i :upto (length $digits) :collect (1+ (mod i 2)))
                 $digits)
-        #$(zerop (mod (apply #'+ (mapcar #'sum-dig $digits)) 10)))))
+      #$(mapcar #$$(if (> $$x 9) (- $$x 9) $$x) $digits)
+      #$(zerop (mod (apply #'+ $digits) 10))))
+
-- 
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