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Strictly answering your question, you could edit this line here
However, ROS topics can be renamed without making code changes
<node pkg="teleop_twist_joy" name="teleop_twist_joy" type="teleop_node">
<rosparam command="load" file="$(find teleop_twist_joy)/config/$(arg joy_config).config.yaml" />
<remap from="cmd_vel" to="My_robot/cmd_vel"/>
</node>