input: Write a python function to handle division with error handling when the denominator is zero.
  assert safe_division(10, 2) == 5
  assert safe_division(10, 0) == "Division by zero error!"
  assert safe_division(7, -1) == -7
output: def safe_division(numerator, denominator):
      try:
          return numerator / denominator
      except ZeroDivisionError:
          return "Division by zero error!"