input: Write a function to create a Text-to-Speech Python application that reads out a given sentence using the pyttsx3 library. The function should take a string as input 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")==None
  assert text_to_speech("Welcome to the Text-to-Speech application")==None
  assert text_to_speech("Hello world!")==None
  assert text_to_speech("This is a test")==None
  assert text_to_speech("")==None
  
  # Output:
  # None (since the function does not return anything)
output: def text_to_speech(sentence):
      import pyttsx3
      engine = pyttsx3.init()
      engine.say(sentence)
      engine.runAndWait()