RFR: 8297814: (fs) Re-visit Path.getExtension return value [v2]

[Stuart Marks]

On Tue, 6 Dec 2022 22:15:23 GMT, Brian Burkhalter <bpb at openjdk.org> wrote:

>> Revise `java.nio.file.Path::getExtension` never to return `null` and to simplify implementing other path manipulations such as removing and replacing the file name extension.
>
> Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:
> 
>   8297814: Address reviewer comments

Updates look good.

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Marked as reviewed by smarks (Reviewer).

PR: https://git.openjdk.org/jdk/pull/11545