Create nested directories in rust

I'm working on a small application to organize my photos with the exif data in the jpeg file. Most importantly I want the date. I should be able to run this on a directory of jpegs.

I want my directory structure to be:

yyyy/
   yyyy-mm-dd/
      photos

I can create the parent directory (yyyy) but I'm not sure how to create the child directory (yyyy-mm-dd) within it.

The most obvious solution to me was to write this:

    let child_dir_name = format!("{}-0{}-0{}", &year, &month, &day);
    let parent_dir_name = format!("{}", &year);
    let path = (parent_dir_name/child_dir_name);
    fs::create_dir(path);

But this doesn't work, for obvious reasons. Any help would be greatly appreciated, still new to Rust so any references/tips would be nice too.

EDIT: I want to use the variable names as the directory names so

fs::create_dir_all(parent_path/child_path);

returns an error: cannot divide &path by &path

You can use std::fs::create_dir_all to create all the directories in a path. See https://doc.rust-lang.org/std/fs/fn.create_dir_all.html

What is happening is that Rust is considering the slash between the two variable names as a divide operator.

You can fix it by replacing (parent_dir_name/child_dir_name) with format!("{}/{}", &parent_dir_name, &child_dir_name)

Additionally you could give this string to Path::new() (with use std::path::Path;) to make this code OS-independant.

Also, as noted by others, to create directories recursively, you will need to use std::fs::create_dir_all instead of std::fs::create_dir