Completed checkpoint 3

Created a function that decrypts by adding (256 -
secret number) and moduloing 256.

ccipher.py

@@ -30,7 +30,15 @@ print(numerify('abc'))
 secret_number = 1
 def encrypt(numeric_message):
     to_encrypt = []
-    for item in numerify(numeric_message):
+    for item in numeric_message:
         to_encrypt.append((item + secret_number) % 256)
     return to_encrypt
-print(encrypt('abc'))
+print(encrypt(numerify('abc')))
+
+# Checkpoint 3
+def decrypt(numeric_message):
+    to_decrypt = []
+    for item in numeric_message:
+        to_decrypt.append((item + (256 - secret_number)) % 256)
+    return to_decrypt
+print(decrypt(encrypt(numerify('abc'))))