How can I expand only a particular subdirectory of a zip(Tree)?

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@Luke it is necessary to coerce the segments back into a String Array after removing elements. The code below works but has the unintended side effect of also copying the original directory structure with no files in it. Any thoughts?

eachFile { FileCopyDetails fcp ->
            if (fcp.relativePath.pathString.startsWith(appName)) {
              // remap the file to the root
              def segments = fcp.relativePath.segments
              def pathsegments =segments[1..-1] as String[]
              fcp.relativePath = new RelativePath(!fcp.file.isDirectory(), pathsegments)
            }
            else {
              fcp.exclude()
            }
        }