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diff --git a/src/o1/Subject.hpp b/src/o1/Subject.hpp
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+++ b/src/o1/Subject.hpp
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+/*******************************************************************************
+################################################################################
+#   Copyright (c) [2020-2021] [HCL Technologies Ltd.]                          #
+#                                                                              #
+#   Licensed under the Apache License, Version 2.0 (the "License");            #
+#   you may not use this file except in compliance with the License.           #
+#   You may obtain a copy of the License at                                    #
+#                                                                              #
+#       http://www.apache.org/licenses/LICENSE-2.0                             #
+#                                                                              #
+#   Unless required by applicable law or agreed to in writing, software        #
+#   distributed under the License is distributed on an "AS IS" BASIS,          #
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   #
+#   See the License for the specific language governing permissions and        #
+#   limitations under the License.                                             #
+################################################################################
+*******************************************************************************/
+
+#ifndef __SUBJECT_HPP__
+#define __SUBJECT_HPP__
+
+
+#include <stdio.h>
+#include <list>
+#include "Observer.hpp"
+
+
+class Subject
+{
+   public:
+
+      Subject() ;
+      ~Subject() ;
+
+      virtual void registerObserver(Observer *observer);
+      virtual void unregisterObserver(Observer *observer);
+      virtual void notifyObservers();
+      virtual void createMessage(char* message );
+    protected:
+      std::list<Observer *> mObserversList;
+      char* mMessage;
+};
+
+#endif
+
+/**********************************************************************
+         End of file
+**********************************************************************/