input: Write a python function to create a basic Tkinter GUI that takes user input and displays it on the screen when a button is clicked.
  assert submit_input("Hello, World!") == "Hello, World!"
  assert submit_input("Test Input") == "Test Input"
  assert submit_input("12345") == "12345"
output: def submit_input(input_text):
      import tkinter as tk
  
      def display_input():
          user_input = entry.get()
          label.config(text=user_input)
          return user_input
  
      root = tk.Tk()
      root.title("Simple Input Display")
  
      entry = tk.Entry(root)
      entry.pack()
  
      submit_button = tk.Button(root, text="Submit", command=display_input)
      submit_button.pack()
  
      label = tk.Label(root, text="")
      label.pack()
  
      entry.insert(0, input_text)
      root.after(100, lambda: submit_button.invoke())
  
      root.mainloop()
  
      return label.cget("text")