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: settings_walker.rb
    path of file: ./repos/manageiq/lib/vmdb
    
    the code of the file until where you have to start completion: module Vmdb
  module SettingsWalker
    PASSWORD_FIELDS = %w[
      password
      _pwd
      _protected
      _secret
      _token
      auth_key
      ssh_key_data
      ssh_key_unlock
      verify
    ].freeze

    PASSWORD_MASK = "********".freeze

    module ClassMethods
      # Walks the settings and yields each value along the way
      #
      # @param settings [Config::
    
      def walk(settings, path = [], &block)
        settings.each do |key, value|
          key_path = path.dup << key

          yield key, value, key_path, settings
          next if key == settings || value == settings

          case value
          when settings.class
            walk(value, key_path, &block)
          when Array
            value.each_with_index do |v, i|
              walk(v, key_path.dup << i, &block) if v.kind_of?(settings.class) && v != settings
            end
          end
        end