input: Write a function to create a Text-to-Speech Python application that reads out a simple sentence. The function should take a string input representing the sentence and use the pyttsx3 library to convert the text to speech.
  
  def text_to_speech(sentence):
      import pyttsx3
      engine = pyttsx3.init()
      engine.say(sentence)
      engine.runAndWait()
  
  assert text_to_speech("Hello, this is a simple sentence") is None
  assert text_to_speech("Another example sentence") is None
  assert text_to_speech("") is None
  assert text_to_speech("Reading this out loud") is None
  
  The function should return None since it performs an action (speaking the sentence) rather than returning a value.
output: def text_to_speech(sentence):
      import pyttsx3
      engine = pyttsx3.init()
      engine.say(sentence)
      engine.runAndWait()