fix this old style code #12
Description
problem
It has been 2 years since this project was initiated and fix fix fix again patch.
Now that, the poor source structure began to be noticeable.
I've gained enough skill and I'll fix it when I have time.
fix the following points.
- type hint
- automatic test
- why main class is separated?
- remove unused tool
- add srudp
Think about incompatible changes.