I deleted the build directory thinking i had just created an empty folder and undo didn’t help/work once i finally discovered my mistake and getting a colleagues version pasted in has left me with things not working as expected/at all.
Assuming you are talking about the /build directory. In that case, delete the /devel folder also using rm -rf /devel , then go to the catkin_ws directory using cd catkin_ws, then compile using
catkin_make;
Then source using:
source ~/catkin_ws/devel/setup.bash
This should rebuild the /build and /devel directories as they were.
Now if you taking about the actual code that is used in the code, i am sure you can download it using a Git file mentioned in the initial chapters.
Let me know if this helped.
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