input: 
  def find_largest_number(numbers: List[int]) -> int:
      """Finds the largest number in the given list of integers.
      >>> find_largest_number([1000, 506, 299, 620, 35])
      1000
      >>> find_largest_number([-1, -5, -10, -3, -7])
      -1
      """
  
output:     if not numbers:
          return None
      largest = numbers[0]
      for number in numbers:
          if number > largest:
              largest = number
      return largest