[RFC Outreachy] Teach ci/check-whitespace to flag incomplete lines as an error

Hello,

While going through the mailing list for some #leftoverbits, I stumbled on this converation. https://public-inbox.org/git/xmqqikla86id.fsf@gitster.g/.

After studying the check-whitespace script, I observed that the script parses each line of the output of the command `git log --check --pretty=format:"---% h% s" "${baseCommit}"..` and formats the result.

But the output of the git command itself does not flag '\no newline at end of file' as it is shown in git diff, in a case where the files does not contain a newline at the end of the file.

One approach I propose to take is to check the each file changed in each commit and check if it has the \n as the last character.

Please, will this be good for a microproject and also I'll appreciate suggestions for the approach. Thank you.

Bello