input: Write a function to take a list of integers and return the sum of the even numbers in the list. If the list is empty, return 0.
  def sum_even_numbers(numbers):
      result = 0
      for number in numbers:
          if number % 2 == 0:
              result += number
      return result
  
  assert sum_even_numbers([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]) == 30
  assert sum_even_numbers([1, 3, 5, 7, 9]) == 0
  assert sum_even_numbers([2, 4, 6, 8, 10]) == 30
  assert sum_even_numbers([]) == 0
  assert sum_even_numbers([0, -2, -4, 6]) == 0
output: def sum_even_numbers(numbers):
      result = 0
      for number in numbers:
          if number % 2 == 0:
              result += number
      return result