input: Write a python function to check if a number is even or odd.
  assert check_even_odd(4) == '4 is an even number'
  assert check_even_odd(7) == '7 is an odd number'
  assert check_even_odd(0) == '0 is an even number'
  assert check_even_odd(9) == '9 is an odd number'
output: def check_even_odd(number):
      if number % 2 == 0:
          return f'{number} is an even number'
      else:
          return f'{number} is an odd number'