This project is based on the project described in the book of Rust ch-12 -> https://doc.rust-lang.org/book/ch12-01-accepting-command-line-arguments.html
$ cargo test
$ cargo run body poem.txt
This is an example and where 'body' is the query to search and poem.txt the file where we want to search.
Another example to search without case sensitive:
$ CASE_INSENSITIVE=1 cargo run are poem.txt
Dany Diaz - 2020