Fix calculation of internal path

start.py

@@ -16,7 +16,7 @@ def to_source_path(path: Path):
     mount_base = PurePosixPath("/mnt") / "source"
     inner_path = PurePosixPath(path)
     with_drive = PurePosixPath(inner_path.parts[0].replace(":", "")).joinpath(*inner_path.parts[1:])
-    return mount_base.joinpath(with_drive)
+    return mount_base / with_drive.relative_to(with_drive.anchor)
 
 
 def main():