use std::path::PathBuf;
use std::env;
use std::io;

fn inner_main() -> io::Result<PathBuf> {
    let exe = env::current_exe()?;
    let dir = exe.parent().expect("Executable must be in some directory");
    let dir = dir.join("nvs");
    Ok(dir)
}

fn main() {
    // inner_main() returns a Result so you need to either handle the error or
    // do what I'm doing which will either return success or panic.
    let path = inner_main().expect("Couldn't get path");

    // It's somewhat involved to turn a PathBuf into a String (and can fail)
    // but you can do it like this.
    let path_string = path.into_os_string().into_string().unwrap();

    println!("Here is the string path: '{}'", path_string);
}