ROS2 create multiple node in 1 package

Hi

Recently i was work on ros2, i would like to ask for advice.
i was using ROS2 Foxy

How to create multiple node in one package. Here is the statement;
2) Running ament to build ydlidar_node and ydlidar_client
3) Create the name “/dev/ydlidar” for YDLIDAR

Thank you