Resolves #118

TODO

• group the code that provide same feature as function
• split into multiple files for better management
• variables name to be consistence over the package and use full name
• add comments to explain the details
• remove .express
• remove .after
• split .ready and .start

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct