custom permalink

Hello,

I can’t write the right code for custom my permalink.

The goal is :
I have a Sql table with some information about product.
so my url to access to product details :
http://www.my-domain.com/?p=260&slug=the-title-of-my-product
I want to transforme this url to the nice url like :
http://www.my-domain.com/fb/the-title-of-my-product

I write this code but it don’t run correctly !

Please help me.
Thanks in advance

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