We are going to create a custom form that is going to have just a text field and a submit button. The idea is that after entering how many Fibonacci numbers we want to generate we are going to click on submit and as a message we are going to see the generated numbers.
In order to achieve that we are going to use Dependency Injection to inject our Fibonacci service and we are going to call it on form submit.
Here is the video on how we created the Fibonacci service: https://youtu.be/1jmOnnCjMT0
The full code of the module you may find here https://github.com/drupal-up/drupalup_fibo_form/tree/master/drupalup_fibo
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