Question: In a flight reservation application, the following Flight class interface is defined. One of the programmers discovers a bug in the void set _ route

In a flight reservation application, the following Flight class interface is defined. One of the programmers discovers a bug in the void set_route(string route_name) function. She corrects the bug by modifying the code in the implementation of the Flight class set_route function. What must be changed in the interface?

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