What is the file extension if the filename has more than one dots in them?

I had a bug in one of my applications so I was wondering what happens if a filename has more than one dot in them. e.g. "hello.world.txt" Will the extension method return txt as I'd expect?

The answer is: yes.

My bug is somewhere else.

examples/extenstion-for-files-with-dot/src/main.rs

use std::path::PathBuf;
fn main() {
    let path = PathBuf::from("code.rs");
    println!("{:?} {:?}", path, path.extension().unwrap());

    let path = PathBuf::from("my-data-1.70.html");
    println!("{:?} {:?}", path, path.extension().unwrap());
}

"code.rs" "rs"
"my-data-1.70.html" "html"