Trailing space in folder is illegal in Windows

[bigtonylewis]

Should you encounter an error that has not already been reported, please do the following when reporting it:
Bug Metadata

• Version of extract_msg: 0.55.0 (as reported when installed using pipx)
• Your python version: Python 3.12.3
• How did you launch extract_msg?
  • [ X] I used the extract_msg package

Describe the bug
When a message's subject is converted into a folder name, if the truncation happens on a space, it makes a folder that is illegal in Windows. This then requires manual intervention to fix.

Ideally, I think the code should check for a trailing space and remove it automatically.

My use case specifically is that my sync between Linux (where I run extract_msg) and Windows then fails because of the illegal filename(s)

Thanks for a super-useful tool.

[bigtonylewis]

See also #467 (comment)