diff --git a/examples/square_worker.cpp b/examples/square_worker.cpp
index c5f4fae..1f08347 100644
--- a/examples/square_worker.cpp
+++ b/examples/square_worker.cpp
@@ -1,6 +1,32 @@
 #include "Worker.h"
 
 
+class SquareWorker: public powerhose::Worker {
+
+    protected:
+        void execute(vector<string>* vreq,  vector<string>* vres);
+    public:
+       SquareWorker(const char* receiverChannel, const char* endPoint);
+};
+
+
+SquareWorker::SquareWorker(const char* receiverChannel, const char* endPoint) : Worker(receiverChannel, endPoint) {
+ //
+};
+
+
+void SquareWorker::execute(vector<string>* vreq,  vector<string>* vres) {
+  int value;
+  string number = vreq->at(2);
+  stringstream ss(number);
+  ss >> value;
+  value *= value;
+  stringstream out;
+  out << value;
+  vres->push_back(out.str());
+}
+
+
 int main(int argc, const char* const argv[]) {
 
 
@@ -8,7 +34,7 @@ int main(int argc, const char* const argv[]) {
   const char* endpoint = "ipc:///tmp/master-routing.ipc";
 
   cout << "Creating a worker" << endl;
-  powerhose::Worker worker(receiver, endpoint);
+  SquareWorker worker(receiver, endpoint);
 
   cout << "Let's run it" << endl;
   worker.run();
diff --git a/libhose/Worker.h b/libhose/Worker.h
index 4befae4..40d35b6 100644
--- a/libhose/Worker.h
+++ b/libhose/Worker.h
@@ -37,8 +37,8 @@ namespace powerhose
         zmq_pollitem_t poll_items[1];
         void callMaster(string* request, string* response);
         const char* receiverChannel;
-    protected:        
-        void execute(vector<string>* vreq,  vector<string>* vres);
+    protected:
+        virtual void execute(vector<string>* vreq,  vector<string>* vres);
 
     public:
        Worker(const char* receiverChannel, const char* endPoint);
diff --git a/libhose/util.cpp b/libhose/util.cpp
index 7a9fd3d..8398ad8 100644
--- a/libhose/util.cpp
+++ b/libhose/util.cpp
@@ -45,12 +45,14 @@ namespace powerhose
   void unserialize(string* data, vector<string>* res) {
     size_t found = 0;
     int current = 0;
+    int size;
     string sep = ":::";
 
     while (found != string::npos) {
-        found = data->find_first_of(sep, current);
+        found = data->find_first_of(sep, current + 1);
         if (found > 0) {
-            res->push_back(data->substr(current, found));
+            size = found - current;
+            res->push_back(data->substr(current, size));
             current = found + sep.size();
         }
     }