input: Write a function to determine if a number is even or odd.
  assert even_or_odd(10) == "Even"
  assert even_or_odd(7) == "Odd"
  assert even_or_odd(0) == "Even"
  assert even_or_odd(1) == "Odd"
output: def even_or_odd(number):
      if number % 2 == 0:
          return "Even"
      else:
          return "Odd"