66. Demultiplexer

How do you plan to solve it?

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