Command execution fails when current working directory is a subdirectory of the input directory

[mkakh]

AdocSimSiG on  dev is 📦 v0.1.0 via 🦀 v1.78.0-nightly 
✦ ❯ cd example/

AdocSimSiG/example on  dev 
✦ ❯ cargo run .
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.02s
     Running `/home/akirahasegawa/repositories/AdocSimSiG/target/debug/adoc-sim-sig .`
* contents
thread 'main' panicked at src/main.rs:172:33:
called `Result::unwrap()` on an `Err` value: Os { code: 17, kind: AlreadyExists, message: "File exists" }
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace