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
);

assign all_known = ^{bus,bus} === 0;
assign has_unknown = ~(^{bus,bus} === 0);
assign bus_if_known = ^{bus,bus} === 0 ? bus : 8'h00;
endmodule