66. Demultiplexer

How do you plan to solve it?

/*Write your code here*/
module demux1to4(
  input d,
  input [1:0]s,
  output [3:0]y
);
assign y[0]=d&(~s[1])&(~s[0]);
assign y[1]=d&(~s[1])&(s[0]);
assign y[2]=d&(s[1])&(~s[0]);
assign y[3]=d&(s[1])&(s[0]);

endmodule