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I see a number of issues here. I think this example is a poor starting point if you are new to ROS.

1. I fixed your "repo" link.
2. The install instructions for that repo are incomplete, because he is using git submodules. That's why the world is missing.
3. The organization of that git repo is not standard, so I'm not sure if it will even work with catkin_make.
4. The instructions fail to tell you to source devel/setup.bash from your top-level catkin_ws directory.