refactor

1 files changed, 1 insertions, 11 deletions

diff --git a/coding-exercises/1/21.rkt b/coding-exercises/1/21.rkt
index 7cda52f..4820b7a 100644
--- a/coding-exercises/1/21.rkt
+++ b/coding-exercises/1/21.rkt
@@ -1,20 +1,10 @@
 #lang racket
-(require racket/pretty)
+(require "../../shared/chapter1.rkt")
 (require sicp)
 
 (define (smallest-divisor n)
   (find-divisor n 2))
 
-(define (find-divisor n test-divisor)
-  (cond ((> (square test-divisor) n) n)
-        ((divides? test-divisor n) test-divisor)
-        (else (find-divisor n (+ test-divisor 1)))))
-
-(define (square x) (* x x))
-
-(define (divides? a b)
-  (= (remainder b a) 0))
-
 ;; (pretty-print (smallest-divisor 199))
 ;; (pretty-print (smallest-divisor 1999))
 ;; (pretty-print (smallest-divisor 19999))