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The quick fix would be to just publish a static transform from base_footprint → bot1_tf/bot1/base_footprint, like this:

rosrun tf static_transform_publisher 0 0 0 0 0 0 base_footprint bot1_tf/bot1/base_footprint 10

The more elegant solution would be to make the node that publishes odom → base_footprint to publish odom → bot1_tf/bot1/base_footprint instead. It looks like that node is called bot1/turtlebot3_core. In the launch file that launches that node, try adding the following parameter:

<param name="tf_prefix" value="bot1_tf/bot1/" />

If that doesn't work, read the documentation or source code for that node to figure out if there is a parameter that allows you to set the output frame to bot1_tf/bot1/base_footprint.