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: html5.rb
    path of file: ./repos/nokogiri/lib/nokogiri
    
    the code of the file until where you have to start completion: # coding: utf-8
# frozen_string_literal: true

#
#  Copyright 2013-2021 Sam Ruby, Stephen Checkoway
#
#  Licensed under
    
      def reencode(body, content_type = nil)
        if body.encoding == Encoding::ASCII_8BIT
          encoding = nil

          # look for a Byte Order Mark (BOM)
          initial_bytes = body[0..2].bytes
          if initial_bytes[0..2] == [0xEF, 0xBB, 0xBF]
            encoding = Encoding::UTF_8
          elsif initial_bytes[0..1] == [0xFE, 0xFF]
            encoding = Encoding::UTF_16BE
          elsif initial_bytes[0..1] == [0xFF, 0xFE]
            encoding = Encoding::UTF_16LE
          end