FIX code bug

app/views/repositories/_commit_author.json.jbuilder

@@ -7,5 +7,5 @@ else
   json.id nil
   json.login name 
   json.name name 
-  json.image_url User.get_letter_avatar_url(name)
+  json.image_url User::Avatar.get_letter_avatar_url(name)
 end

app/views/repositories/commits.json.jbuilder

@@ -26,7 +26,7 @@ else
           json.login commit['commit']['author']['name']
           json.type nil
           json.name commit['commit']['author']['name']
-          json.image_url User.get_letter_avatar_url(commit['commit']['author']['name'])
+          json.image_url User::Avatar.get_letter_avatar_url(commit['commit']['author']['name'])
         end
       end
     end