Recompile turtlebot from source problem [closed]

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Hi Everyone, I need to implement a multi-turtlebot application with Hydro ROS so that I installed the turtlebot from source using the instructions below (http://wiki.ros.org/turtlebot/Tutorials/hydro/Installation) :

 mkdir ~/turtlebot
 cd ~/turtlebot
 wstool init src https://raw.github.com/turtlebot/turtlebot/hydro/turtlebot.rosinstall -j8
 source /opt/ros/hydro/setup.bash
 rosdep install --from-paths src -i -y
 catkin_make

I spawned two turtlebots but I have problem with the “odom” topic that doesn’t resolve correctly. I am getting just one “/odom” topic instead of two like “robot1/odom” and “robot2/odom”

Since I have this problems, incorrect resolution of each robot prefix, I made some changes on the source file gazeboroscreate.cpp located at HOME/turtlebot/src/turtlebot_create_desktop/create_gazebo_plugins/src Then, I compiled the from ”/turtlebot” “folder” using “catkin_make” but I noticed that my changes didn’t take effect. Am I doing something wrong? Or Do I need to do something else to see the effect of my changes?

Please any help would be very much appreciated!! Thanks