Multiply Strings

class Solution:
    def multiply(self, num1: str, num2: str) -> str:
        ans=""
        if(num1=='0' or num2=='0'):
            ans="0"
            return ans
        else:
            realans=0
            for i in range(len(num1)-1,-1,-1):
                carry=0
                for j in range(len(num2)-1,-1,-1):
                    x=str(int(num1[i])*int(num2[j])+carry)
                    if(len(x)>1):
                        carry=int(x[0])
                        ans=x[1]+ans
                    else:
                        ans=x+ans
                        carry=0
                if(carry>0):
                    ans=str(carry)+ans
                    carry=0
                p=pow(10,len(num1)-1-i)
                y=int(ans)*p
                realans+=y
                ans=''
            return str(realans)