input: Write a python function to create a simple tkinter application with a label displaying "Hello, World!" and a button labeled "Click Me!".
  assert create_tkinter_app() is None
output: def create_tkinter_app():
      import tkinter as tk
      
      def on_button_click():
          print("Button clicked!")
  
      root = tk.Tk()
      root.title("Simple Tkinter App")
      
      label = tk.Label(root, text="Hello, World!")
      label.pack(pady=10)
      
      button = tk.Button(root, text="Click Me!", command=on_button_click)
      button.pack(pady=10)
      
      root.mainloop()