Create circularTour

circularTour

@@ -0,0 +1,18 @@
+int tour(petrolPump p[],int n)
+    {
+       int startPoint=0;
+       int out_of_tank=0;
+       int in_tank=0;
+       for(int i=0;i<n;i++){
+           tank+=(p[i].petrol-p[i].distance);
+           if(tank<0){
+               out_of_tank+=tank; //saving all losses 
+               in_tank=0; //resetting tank 
+               start=i+1; //resetting start point to next
+           }
+       }
+       if(out_of_tank+in_tank>=0){  //if our current tank oil lvel can travel all throught the losses
+           return start;
+       }
+       return -1;  //without double while loop
+    }