input: Write a function to design an algorithm in Python to add two large numbers represented as strings. This function should take two strings as input, add them together, and return the result as a string.
  
  def add_large_numbers(num1, num2):
      num1 = num1[::-1]
      num2 = num2[::-1]
      carry = 0
      result = ""
  
      for i in range(max(len(num1), len(num2))):
          if i < len(num1):
              digit1 = int(num1[i])
          else:
              digit1 = 0
  
          if i < len(num2):
              digit2 = int(num2[i])
          else:
              digit2 = 0
          
          sum_total = digit1 + digit2 + carry
          carry = sum_total // 10
  
          result += str(sum_total % 10)
  
      if carry > 0:
          result += str(carry)
  
      return result[::-1]
  
  assert add_large_numbers("111", "1337")=="1448"
  assert add_large_numbers("0", "0")=="0"
  assert add_large_numbers("999", "1")=="1000"
  assert add_large_numbers("123456789", "987654321")=="1111111110"
  assert add_large_numbers("1", "999999999")=="1000000000"
output: def add_large_numbers(num1, num2):
      num1 = num1[::-1]
      num2 = num2[::-1]
      carry = 0
      result = ""
  
      for i in range(max(len(num1), len(num2))):
          if i < len(num1):
              digit1 = int(num1[i])
          else:
              digit1 = 0
  
          if i < len(num2):
              digit2 = int(num2[i])
          else:
              digit2 = 0
          
          sum_total = digit1 + digit2 + carry
          carry = sum_total // 10
  
          result += str(sum_total % 10)
  
      if carry > 0:
          result += str(carry)
  
      return result[::-1]