find the extension of a file in rust

To find the extension of a file in Rust, you can use the Path module from the standard library. You can use the extension() method on a Path object to get the extension of the file. Here's an example:

main.rs
use std::path::Path;

fn main() {
    let file_path = Path::new("/path/to/file.txt");
    if let Some(extension) = file_path.extension() {
        println!("The file extension is: {}", extension.to_string_lossy());
    }
}
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In this example, we create a Path object representing the file we want to get the extension of. We then call the extension() method on the Path object, which returns an Option<&OsStr> object representing the extension if there is one. We use Rust's if let syntax to check if there is an extension, and if there is, we print it to the console using the to_string_lossy() method.