input: Write a python function to simulate button presses on a Tkinter calculator and return the final input field value.
  assert simulate_button_presses(['1', '2', '+', '3', '4']) == '12+34'
  assert simulate_button_presses(['5', '6', '-', '1', '0']) == '56-10'
  assert simulate_button_presses(['7', '8', '*', '9']) == '78*9'
  assert simulate_button_presses(['1', '0', '/', '2']) == '10/2'
output: def simulate_button_presses(buttons):
      input_field = ""
      for button in buttons:
          input_field += button
      return input_field