make clippy happy and add a github workflow

[AucaCoyan]

Hi! It's me again.
I made clippy stop complaining and setup a github workflow, so we can have alerts when commits are not compliant.

[fdncred]

Thanks!

[amtoine]

looking good, looking good 😊

@AucaCoyan now some tests? 😏

[AucaCoyan]

I would like to!
First I need to refactor the code to be able to format a String or stdin.
Then all the examples go down the toilet and we write tests for everything.
It's also a nice moment to add tests in CI

[amtoine]

I would like to! First I need to refactor the code to be able to format a String or stdin. Then all the examples go down the toilet and we write tests for everything. It's also a nice moment to add tests in CI

sounds great to me 👌