input: Write a python function to update the maximum price if the current price exceeds it.
  assert update_max_price(10, 5) == 10
  assert update_max_price(5, 10) == 10
  assert update_max_price(7, 7) == 7
output: def update_max_price(current_price, max_price):
      if current_price > max_price:
          max_price = current_price
      return max_price