Github user EbenZhang commented on the issue:
https://github.com/apache/logging-log4net/pull/13
My branch is already based on the `Develop` branch. The whitespace issue is
not fixed in `Develop` branch, see the source code on GitHub
https://raw.githubusercontent.com/apache/logging-log4net/develop/src/Appender/RollingFileAppender.cs,
search for `string extension = Path.GetExtension(archiveFileBaseName);`, you
will see the code is not aligned properly.
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