To uninstall debian-builder just follow these instructions.
/debian/stretch/main///install/index.html Rebuild Debian packages from source code Debian 9.0 admin 1.8
sudo apt-get remove debian-builder
Which will remove just the debian-builder package itself.
sudo apt-get remove --auto-remove debian-builder
This will remove the debian-builder package and any other dependant packages which are no longer needed.
If you also want to delete your local/config files for debian-builder then this will work.
sudo apt-get purge debian-builder
Or similarly, like this debian-builder
sudo apt-get purge --auto-remove debian-builder
|Description||Rebuild Debian packages from source code|