D18915: Fix batchrename changing extension to lower case

[Stefan Brüns]

bruns added a comment.


  And factor out the function, it is used in 2 places, and you can unit test it then.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D18915

To: cfoster, #dolphin, #frameworks, abalaji
Cc: bruns, ngraham, elvisangelaccio, chinmoyr, kde-frameworks-devel, michaelh
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