Reverse words. Seems to work but the Rspec fails

gistfile1.txt

def reverse_words(str)
  array = []
  result = ""
  str.each_line(" ") { |s| array.push(s.reverse)}
  array.each do |i|
  result = result + i +" "
  end
  result = result.chop.lstrip
  puts result
  return result
end