bug: cargo sort reports "No file found at" error when there are dots in directory path.

[liurenjie1024]

How to reproduce

1. Download https://dist.apache.org/repos/dist/dev/iceberg/iceberg-rust-0.2.0-rc.1/apache-iceberg-rust-0.2.0-src.tar.gz
2. Run mkdir tmp && cd tmp && tar -xzf ../apache-iceberg-rust-0.2.0-src.tar.gz && cd apache-iceberg-rust-0.2.0-src
3. Run cargo sort -c -w

Then it reports "No file found at" error.

Investigation

I think the bug is in this line, since it considers any path which contains dots as file with extension.

If we rename dir name apache-iceberg-rust-0.2.0-src to anything without dots, it works fine.