Modify: add explanation
Merge branch 'feature/2-3-1' into develop
Modify: add explanation why use log()?
Merge branch 'feature/2-3-3' into develop
Modify: fix typo
Merge branch 'feature/typo' into develop
Modify: write README
Modify: use code style
Modify: newline
Modify: if you find some mistakes, please use pull request
Modify: newline
Merge branch 'feature/README' into develop
Modify: add a slide where I explained