input: Write a function to calculate the absolute difference between two given numbers. The function should return the absolute value of the difference. If one of the input numbers is missing or not provided, the function should raise an appropriate exception.
  assert absolute_difference(9, 5) == 4
  assert absolute_difference(-9, 5) == 14
  assert absolute_difference(0, 0) == 0
  assert absolute_difference(10, -10) == 20
  assert absolute_difference(3, 3) == 0
output: def absolute_difference(a, b):
      if a is None or b is None:
          raise ValueError("Both numbers must be provided")
      return abs(a - b)