44. Bus Error Checker

How do you plan to solve it?

/*Write your code here*/
module error_checker_xz(
    input [7:0] bus,
    output all_known, has_unknown,
    output [7:0] bus_if_known
);
    wire any_xz = (^(bus^bus) === 1'bx);
    assign has_unknown = any_xz;
    assign all_known = ~any_xz;
    assign bus_if_known = all_known ? bus : 8'b0000_0000;

endmodule