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: camelize.rb
    path of file: ./repos/leftovers/lib/leftovers/processors
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Leftovers
  module Processors
    class Camelize
      include ComparableInstance

      def initialize(then_processor)
        @then_processor = then_processor

        freeze
      end

  
    
      def process(str, current_node, matched_node, acc)
        return unless str

        @then_processor.process(str.camelize, current_node, matched_node, acc)
      rescue ::NoMethodError
        ::Leftovers.error <<~MESSAGE
          Tried using the ::String#camelize method, but the activesupport gem was not available and/or not required
          `gem install activesupport`, and/or add `requires: ['active_support', 'active_support/core_ext/string']` to your .leftovers.yml
        MESSAGE
      end