This is my personal template for when solving small problems in Rust.
The idea is that you copy the template when starting a new project with copy-templ.sh /path/to/new/project (can be called from outside this folder). Then you solve the problem in main.rs using helper functions, such as parsing a String iterator to integers, from the included library. Finally, if you want to submit the code to a website, you can run bundle.sh to bundle all of src/ into a single bundled.rs source code file.