[CLEANUP] Use module_function to create module functions

.rubocop_todo.yml

@@ -1,27 +1,11 @@
 # This configuration was generated by
-# `rubocop --auto-gen-config --exclude-limit 10000`
-# on 2023-10-05 13:54:27 UTC using RuboCop version 1.56.4.
+# `rubocop --auto-gen-config`
+# on 2023-10-06 15:01:33 UTC using RuboCop version 1.56.4.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
 
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: Severity, Include.
-# Include: **/*.gemspec
-Gemspec/DeprecatedAttributeAssignment:
-  Exclude:
-    - 'page_title_helper.gemspec'
-
-# Offense count: 5
-# Configuration parameters: EnforcedStyle, AllowedGems, Include.
-# SupportedStyles: Gemfile, gems.rb, gemspec
-# Include: **/*.gemspec, **/Gemfile, **/gems.rb
-Gemspec/DevelopmentDependencies:
-  Exclude:
-    - 'page_title_helper.gemspec'
-
 # Offense count: 1
 # Configuration parameters: AllowedParentClasses.
 Lint/MissingSuper:
@@ -53,23 +37,7 @@ Rails/RootPathnameMethods:
   Exclude:
     - 'lib/page_title_helper.rb'
 
-# Offense count: 1
-# This cop supports unsafe autocorrection (--autocorrect-all).
-# Configuration parameters: EnforcedStyle.
-# SupportedStyles: always, always_true, never
-Style/FrozenStringLiteralComment:
-  Exclude:
-    - 'page_title_helper.gemspec'
-
 # Offense count: 1
 Style/MixinUsage:
   Exclude:
     - 'Rakefile'
-
-# Offense count: 1
-# This cop supports unsafe autocorrection (--autocorrect-all).
-# Configuration parameters: EnforcedStyle, Autocorrect.
-# SupportedStyles: module_function, extend_self, forbidden
-Style/ModuleFunction:
-  Exclude:
-    - 'lib/page_title_helper.rb'

lib/page_title_helper.rb

@@ -14,7 +14,7 @@
 module PageTitleHelper
   # https://github.com/thoughtbot/paperclip/blob/master/lib/paperclip/interpolations.rb
   module Interpolations
-    extend self
+    module_function
 
     def self.interpolate(pattern, *args)
       instance_methods(false).sort.reverse.inject(pattern.to_s.dup) do |result, tag|