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,
    output has_unknown,
    output [7:0] bus_if_known
);
reg any_unknown;
integer i;

always@(*)begin
any_unknown = 0;
for (i=0; i<8; i++)begin
    if (bus[i] !== 1'b0 && bus[i] !== 1'b1 )begin
        any_unknown = 1;
           end
end
end
assign has_unknown = any_unknown;
assign all_known = ~any_unknown;
assign bus_if_known = all_known ? bus : 8'h00;

endmodule