input: Write a function to add two large numbers represented as strings. The function should reverse the strings, iterate through the digits, sum them up while considering the carry, and return the final result as a string. 
  assert add_large_numbers("111", "1337")=="1448"
  assert add_large_numbers("123", "456")=="579"
  assert add_large_numbers("1000", "9000")=="10000"
  assert add_large_numbers("999", "1")=="1000"
  assert add_large_numbers("0", "0")=="0"
output: def add_large_numbers(num1, num2):
      num1, num2 = num1[::-1], num2[::-1]
      carry = 0
      result = []
      max_len = max(len(num1), len(num2))
      
      for i in range(max_len):
          digit1 = int(num1[i]) if i < len(num1) else 0
          digit2 = int(num2[i]) if i < len(num2) else 0
          total = digit1 + digit2 + carry
          carry = total // 10
          result.append(str(total % 10))
      
      if carry:
          result.append(str(carry))
      
      return ''.join(result[::-1])