How to add title value to subject in contact form 7?

I have this contact form
enter image description here

And this is how the front-end looks like
enter image description here

The url of the page is example.com/listing/philly-4-beds-1-5-baths-single-family/#contact

I need to have the subject set as Philly 4 beds 1 5 baths single-family (the title).

Here is my code in functions.php

What should I add inside the function to set the subject with the value of the title?Thank you!