input: Write a python function to generate a sentence from a list of words.
  assert generateSentence(["The","quick","brown","fox","jumped","over","the","lazy","dog"])=="The quick brown fox jumped over the lazy dog ."
  assert generateSentence(["Hello","world"])=="Hello world ."
  assert generateSentence(["Python","is","awesome"])=="Python is awesome ."
output: def generateSentence(words):
      return ' '.join(words) + ' .'