Fix

app/services/contact_details/github.rb

@@ -12,6 +12,6 @@ class ContactDetails::Github < ContactDetails::SocialNetwork
                         .remove('www.')
                         .remove('github.com')
                         .remove('@')
-                        .remove('/')
+                        .delete_prefix('/')
   end
 end
\ No newline at end of file

test/services/contact_details_test.rb

@@ -64,6 +64,12 @@ class ContactDetailsTest < ActiveSupport::TestCase
         'https://github.com/noesya',
         'https://www.github.com/noesya',
       ]
+    batch_test :github, 'osunyorg/admin', 'https://github.com/osunyorg/admin', [
+        'osunyorg/admin',
+        'github.com/osunyorg/admin',
+        'https://github.com/osunyorg/admin',
+        'https://www.github.com/osunyorg/admin',
+      ]
   end
 
   test 'instagram' do