#include <string>
#include <iostream>
using namespace std;

void splitstring(string str, string seperater, string &first, string &second) //will split a string into 2
{
     int i = (int)str.find(seperater); //find seperator
     if(i != -1)
     {
          int y = 0;
          if(!str.empty())
          {
               while(y != i)
               {
                    first += str[y++]; //creating first string
               }
               y = y+(int)seperater.length(); //jumping forward seperater length
               while(y != str.length())
               {
                    second += str[y++]; //creating second string
               }
               
          }
     }
     else
     {
          first = str;
          second = "NULL"; //if seperator is not there then second string == null 
     }
}

void main()
{
      stirng a, b, c;
      a.assign("Hello world!");
      splitstring(a, " ", b, c);
      cout << "b = " << b << endl << "c = " << c << endl;
      //b == Hello
      //c == world!
}