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Remove Url Parameter WordPress

I have problem with search in WordPress. I want to remove the ā€œsā€ parameter in the URL. This is my URL:

www.example.com?post_type=tour&s=&tour_location=70&tour_types=116&tour_month=144&tour_year=66

I want the URL to look like:

www.example.com?post_type=tour&tour_location=70&tour_types=116&tour_month=144&tour_year=66

How do I need to modify my code?