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;
    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