input: Write a function to create a Text-to-Speech application in Python using the pyttsx3 library that reads out a given sentence. The function should initialize the text-to-speech engine, say the provided sentence, and wait for the speech to complete.
  
  import pyttsx3
  
  def text_to_speech(sentence):
      engine = pyttsx3.init()
      engine.say(sentence)
      engine.runAndWait()
  
  assert text_to_speech("Hello, this is a simple sentence") == None
  assert text_to_speech("Good morning!") == None
  assert text_to_speech("") == None
output: def text_to_speech(sentence):
      engine = pyttsx3.init()
      engine.say(sentence)
      engine.runAndWait()