Function sanitize_filename 

pub fn sanitize_filename(filename: &str) -> String

Sanitizes a filename by replacing invalid Windows characters.

This function ensures filenames are valid on Windows by:

• Replacing invalid characters (< > : " / \ | ? *) with underscores
• Removing leading/trailing whitespace and dots
• Using a default name if the result is empty

Arguments

• filename - The filename to sanitize

Returns

Returns a Windows-compatible filename.

Examples

assert_eq!(sanitize_filename("my:file?.txt"), "my_file_.txt");
assert_eq!(sanitize_filename("   .hidden   "), "hidden");
assert_eq!(sanitize_filename("<<<"), "___");
assert_eq!(sanitize_filename("..."), "unnamed_file");