You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: model_inclusions.rb
    path of file: ./repos/attribute_normalizer/lib/attribute_normalizer
    
    the code of the file until where you have to start completion: module AttributeNormalizer

  def self.included(base)
    base.extend ClassMethods
  end

  module ClassMethods

    d
    
    def normalize_attributes(*attributes, &block)
      options = attributes.last.is_a?(::Hash) ? attributes.pop : {}

      normalizers      = [ options[:with] ].flatten.compact
      normalizers      = [ options[:before] ].flatten.compact if block_given? && normalizers.empty?
      post_normalizers = [ options[:after] ].flatten.compact if block_given?

      if normalizers.empty? && !block_given?
        normalizers = AttributeNormalizer.configuration.default_normalizers # the default normalizers
      end