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Rather than modifying the code directly, you can change topic names with remapping:

rosrun my_package my_node cmd_vel:=cmd_vel_mux/input/navi

Who to notify depends on where the sample is hosted. If it's a book, you should contact the author (maybe by opening a ticket on their bug tracker, if they have one). If it's a wiki page, you may just be able to update the wiki page with a different command for the turtlebot2 .

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