in an empty catkin_ws:

mkdir src
cd src
catkin_create_pkg projet rospy urdf message_runtime

go to projet (from catkin_ws):

cd src/projet

pull from current repo or download as zip: copy the files into catkin_ws/src/projet

back in catkin_ws:

catkin_make

source ~/.bashrc

Launch Challenges

To launch the challenge 1 and 2:

roslaunch projet challenge1and2.launch

To launch the challenge 3:

roslaunch projet challenge3.launch

To launch all of the challenges :

roslaunch projet challenge_all.launch

Structure

.
└── catkin_ws/
    ├── build
    ├── devel
    └── src/
        └── projet/
            ├── config/
            │   └── color_ranges.yaml
            ├── launch/
            │   ├── challenge1and2.launch
            │   └── challenge3.launch
            ├── msg/
            │   └── LinePosition.msg
            ├── rviz/
            │   ├── config.rviz
            │   └── config_cam.rviz
            ├── src
            ├── srv/
            │   └── StartCorridor.srv
            ├── urdf
            ├── worlds
            ├── CMakeLists.txt
            └── package.xml