fix: don't strip prefix if path is exactly "."

[wxsBSD]

One of the things I often run is "yr scan -r rules.yara ." when I have a collection of samples and I want to scan all of them in the current directory.

With the fix in #280 the path was being stripped to an empty string which would result in an error when trying to scan. Fix it by only performing the strip if the path is not equal to ".".

[code-review-assist]

Hi team,

I'm currently reviewing this pull request and will provide feedback shortly. In the meantime, here's a summary for you and other reviewers to quickly get up to speed:

This pull request addresses an issue where using . as a path argument in the yr scan command resulted in an error due to path stripping. The intent is to fix this behavior so that users can scan all files in the current directory using yr scan rules.yara ..

Here's a breakdown of the changes:

• cli/src/tests/mod.rs (lines 287-296): Added a new test case to explicitly handle the . path argument, ensuring the fix works as expected.
• cli/src/walk.rs (lines 206-219): Modified the Walker implementation to conditionally strip the prefix only if the path is not exactly .. This prevents the stripping when the path is just ., allowing the scan to work correctly in the current directory.

The core change involves adding a conditional check before stripping the prefix from the path. This ensures that if the path is exactly ., the prefix is not stripped, resolving the issue.

I'll have a more detailed review shortly. Until then, here's a little something to lighten the mood:

A dot, small and slight,
Holds a directory's might,
No longer a fright.

Best,
Gemini

[code-review-assist]

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