Synchronously renames this directory. Returns a Directory instance for the renamed directory.
If newPath identifies an existing directory, that directory is replaced. If newPath identifies an existing file the operation fails and an exception is thrown.
Directory renameSync(String newPath);
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-io/Directory/renameSync.html