input: Write a function to take a list of integers and return the sum of the even numbers in the list. The function should return the sum of all even numbers present in the list. If the list is empty, the function should 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
  
output: def sum_even_numbers(numbers):
      result = 0
      for number in numbers:
          if number % 2 == 0:
              result += number
      return result