66. Demultiplexer

How do you plan to solve it?

/*Write your code here*/
module demux1to4(d,s,y);
input d;
input [1:0]s;
output reg [3:0]y;
always @(*) begin
    case(s)
    2'b00:y={3'b000,d};
    2'b01:y = {2'b00,d,1'b0};
    2'b10:y = {1'b0,d,2'b00};
    2'b11:y = {d,3'b000};
    endcase
end
endmodule