Autoload All Files in Lib Directory Ruby on Rails

In Ruby on Rails to create your own ruby library you have to create ruby library in /lib directory, so far so good to autoload all ruby library in /lib directory you have to add some code below in /config/application.rb.

application.rb 
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config.autoload_paths += %W(#{config.root}/lib)
config.autoload_paths += Dir["#{config.root}/lib/**/"]
config.autoload_paths << "#{config.root}/lib"