pig_latin.rb

elsif word.index("qu")				#word contains 'qu'.
  if word[0..1].include?("qu")	#word begins with 'qu'.
      result << word[2..-1] + word[0..1] + "ay"
	else							#'qu' is somewhere else in the word.
	  	position = word.index("qu")
	  	result << word[0..(position - 1)] + "qu" + word[(position + 2)..-1] + "ay"
	end
end