Corrected with rubocop cop 'Style/TrailingWhitespace'.

config/initializers/omniauth.rb

@@ -1,6 +1,6 @@
 Rails.application.config.middleware.use OmniAuth::Builder do
 
-  # twitter database connect 
+  # twitter database connect
   provider :twitter_database, 'not_change_will_be_set_by_databse', 'not_change_will_be_set_by_databse',
     client_options: { authorize_path: '/oauth/authorize', site: 'https://api.twitter.com' }
 

db/migrate/20120101000070_create_channel.rb

@@ -1,6 +1,6 @@
 class CreateChannel < ActiveRecord::Migration
   def up
-    
+
     create_table :channels do |t|
       t.references :group,                                null: true
       t.column :adapter,        :string, limit: 100,   null: false

db/migrate/20130815000002_update_ticket_number.rb

@@ -8,14 +8,14 @@ class UpdateTicketNumber < ActiveRecord::Migration
      number, the SystemID and the counter are used with SystemID.Counter format (e.g. 1010138, 1010139).
      With "Date" the ticket numbers will be generated by the current date, the SystemID and the counter.
      The format looks like Year.Month.Day.SystemID.counter (e.g. 201206231010138, 201206231010139).
-     With param "Checksum => true" the counter will be appended as checksum to the string. The format 
+     With param "Checksum => true" the counter will be appended as checksum to the string. The format
      looks like SystemID.Counter.CheckSum (e. g. 10101384, 10101392) or Year.Month.Day.SystemID.Counter.CheckSum (e.g. 2012070110101520, 2012070110101535).',
       options: {
         form: [
           {
             display: '',
             null: true,
-            name: 'ticket_number', 
+            name: 'ticket_number',
             tag: 'select',
             options: {
               'Ticket::Number::Increment' => 'Increment (SystemID.Counter)',

db/seeds.rb

@@ -768,7 +768,7 @@ Setting.create_if_not_exists(
  number, the SystemID and the counter are used with SystemID.Counter format (e.g. 1010138, 1010139).
  With "Date" the ticket numbers will be generated by the current date, the SystemID and the counter.
  The format looks like Year.Month.Day.SystemID.counter (e.g. 201206231010138, 201206231010139).
- With param "Checksum => true" the counter will be appended as checksum to the string. The format 
+ With param "Checksum => true" the counter will be appended as checksum to the string. The format
  looks like SystemID.Counter.CheckSum (e. g. 10101384, 10101392) or Year.Month.Day.SystemID.Counter.CheckSum (e.g. 2012070110101520, 2012070110101535).',
   options: {
     form: [

lib/auth/ldap.rb

@@ -76,7 +76,7 @@ module Auth::Ldap
       else
         user.update_attributes( user_attributes )
         puts "NOTICE: user updated '#{user.login}'"
-      end    
+      end
     end
 
     # return if it was not possible to create user