66. Demultiplexer

How do you plan to solve it?

module demux1to4(
    input d,
    input [1:0] s,
    output reg [3:0] y
);

always @(*) begin
    y = 4'b0000;
    case(s) 
    2'b00 : y[0] = d;
    2'b01 : y[1] = d;
    2'b10 : y[2] = d;
    2'b11 : y[3] = d;
    endcase
end
endmodule