<launch>
        <node pkg="my_beginner" type="talker" name="talker_test" output="screen">
                <remap from="/chatter" to="/re_name" />
        </node>

        <node pkg="my_beginner" type="listener" name="listener_test" output="screen">
                <remap from="/chatter" to="/re_name" />
        </node>

        <node pkg="turtlesim" type="turtlesim_node" name="turtle_graph" output="screen">
        </node>


</launch>