Hey! First off, thanks for this great tool! I have one minor issue, here's how to reproduce:

1. Use bench_function_over_inputs and use strings for the input such as "foo/bar"
2. Run the benchmark
3. Look at the file names in the target directory

Expected: Not sure what :).
Actual: The files look like this:

• target/criterion/fun/
  • "foo/
    • bar"/

While it makes sense, it's kind of unexpected and I wonder if it might be a good idea to replace special characters such as / and " before using them in file names. What do you think?

(This came up here and I have a minimal repo to reproduce it here.)