66. Demultiplexer

How do you plan to solve it?

/*Write your code here*/
module demux1to4(
    input d,
    input [1:0] s,
    output reg [3:0] y
);

    always @* begin
        y = 4'b0000;
        if (d == 1'b1)  y[s] = d;
    end

endmodule