How to create a custom URL format?

Question

Hi, I have a Q2A website and my question URL looks like this. 

http://mywebsite.com/q2a/123/my-question

But I want something like this. 

http://mywebsite.com/q2a/my-question-123 

How can I achieve this? I could able to encode the URL in this format by editing qa_base.php->qa_q_request() function's return value. But I'm struggling a lot to decode the URL. Whenever I click on a question's URL it goes to the modified URL itself. But I'm getting question page not found error. If you know how to fix this, do let me know. 

Any help would be highly appeciated.

Thanks.  

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