fix: resolve command incompatibility issue on Windows

[gamjaa]

This is a PR for issue #85.

Some commands did not work as intended on Windows, so I made some modifications to the code.

• mkdir -p can be replaced with mkdir, but it returns an error if the directory already exists.
• rm -rf can be replaced with rmdir /S /Q
• On Windows, echo outputs the " characters as-is.

To make the code OS-agnostic, I replaced the commands with os.MkdirAll and os.RemoveAll.

[ashishb]

Please format the code with 'make format'

[gamjaa]

@ashishb I've fixed the issue and committed the changes. Please review again.