Where is print_xacros ?

Hi, I've tried `modular_policy/simulate_policy.py` to see how your codes work.
However, I encountered an error when loading the URDF file by `p.loadURDF` in `robot_env.py`.

I think this is because the urdf folder you provided only contains .xacro or .stl files and necessary to be compiled to urdf format. I found you got the job done in `visualize_robot.ipynb` using compile_to_urdf function. But I could not find print_xacros where you imported it from.

If possible, I would like you to provide print_xacro's source code. Thanks in advance.

Start with modular_policy/simulate_policy.py and robot_env.py to trace the p.loadURDF failure, then inspect visualize_robot.ipynb and its use of compile_to_urdf. Check where print_xacros is imported from and how the URDF files are expected to be generated. Done means the source or location is available and the documented workflow can load the robot URDF successfully.

Written by the indexing model from the issue text.