Function into_collapsed 

pub fn into_collapsed(path: impl Into<Utf8PathBuf>) -> Utf8PathBuf

Collapses a path buffer without performing I/O.

• Resolves ../ segments where possible.
• Removes ./ segments, except when leading
• All redundant separators and up-level references are collapsed.

Example:

• a/b/../c becomes a/c
• a/../../c becomes ../c
• ./some becomes ./some
• ./some/./path becomes ./some/path
• /a/../c becomes /c
• /a/../../c becomes /c

However, this does not resolve symbolic links. It consumes the input Utf8PathBuf and returns a new one.