lzy@lzy-vpc:~/dev-ws$  colcon build
[0.626s] ERROR:colcon:colcon build: Duplicate package names not supported:
- learning_pkg_c:
  - src/learning_pkg_c
  - src/ros2_21_tutorials/learning_pkg_c
- learning_pkg_python:
  - src/learning_pkg_python
  - src/ros2_21_tutorials/learning_pkg_python