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

I have this contact form
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And this is how the front-end looks like
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The url of the page is

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!