Multiply Strings

Given two numbers represented as strings, return multiplication of the numbers as a string.

Note: The numbers can be arbitrarily large and are non-negative.

 class Solution {

 public:

     string multiply(string num1, string num2) {

         if(num1==""||num2=="") return "";

         while(num1[]=='') num1.erase();

         while(num2[]=='') num2.erase();

         int n1=num1.size();

         int n2=num2.size();

         int *numArr1=new int[n1];

         int *numArr2=new int[n2];

         int *result=new int[n1+n2];

         memset(result,,sizeof(int)*(n1+n2));

         for(int i=;i<n1;i++) numArr1[i]=num1[i]-'';

         for(int i=;i<n2;i++) numArr2[i]=num2[i]-'';

         for(int i=;i<n1;i++)

         {

             for(int j=;j<n2;j++)

             {

                 result[i+j+]+=numArr1[i]*numArr2[j];

             }

         }

         int carry=;

         for(int i=n1+n2-;i>=;i--)

         {

             result[i]+=carry;

             if(result[i]>=)

             {

                 carry=result[i]/;

                 result[i]=result[i]%;

             }

             else

             {

                 carry=;

             }

         }

         string resultStr;

         int k=;

         while(result[k]==) k++;

         for(int i=k;i<n1+n2;i++)

         {

             resultStr.push_back(result[i]+'');

         }

         return resultStr;

     }

 };