Add Strings (Leetcode 415)

Problem Link: https://leetcode.com/problems/add-strings/

class Solution:
    def addStrings(self, num1: str, num2: str) -> str:
        
        n1=0
        n2=0
        for i in num1:
            digit=ord(i)-ord('0')
            n1=n1*10+digit
        
        for i in num2:
            digit=ord(i)-ord('0')
            n2=n2*10+digit
        # print(n1,n2)
        return str(n1+n2)