fix some useranswer compare issuses

rapids/models.py

@@ -76,8 +76,8 @@ def image_directory_path(instance, filename):
 
 
 def get_answer_compare(s):
-    s = s.strip().lower()
-    s = s.translate(str.maketrans("", "", string.punctuation.replace("#", "")))
+    s = s.strip().translate(str.maketrans("", "", string.punctuation.replace("#", ""))).lower()
+    s = " ".join(s.split())
     return s
 
 
@@ -804,13 +804,7 @@ class UserAnswer(UserAnswerBase):
         self.score = Answer.MarkOptions.UNMARKED
         if self.answer:
             self.answer = self.answer.strip()
-
-            s = self.answer.lower()
-            s = s.translate(
-                str.maketrans("", "", string.punctuation.replace("#", ""))
-            ).strip()
-
-            self.answer_compare = s
+            self.answer_compare = get_answer_compare(self.answer)
         else:
             self.answer = ""
             self.answer_compare = ""