#!/usr/bin/env ruby

str = ARGV[0]

def string_object_to_utf16 str
  [str.force_encoding(::Encoding::US_ASCII)].pack('H*').force_encoding ::Encoding::UTF_16BE
end

def string_object_to_utf8 str
  [str.force_encoding(::Encoding::US_ASCII)].pack('H*').force_encoding ::Encoding::UTF_8
end

def utf16_to_utf8 str
  str.encode ::Encoding::UTF_8
end

def decode_hexified_utf16_string_object str
  utf16_to_utf8 string_object_to_utf16 str
end

def decode_hexified_utf8_string_object str
  string_object_to_utf8 str
end

if ARGV[1] == 'utf8'
  puts decode_hexified_utf8_string_object ARGV[0].dup
else
  puts decode_hexified_utf16_string_object ARGV[0].dup
end