66. Demultiplexer

How do you plan to solve it?

module demux1to4(
input d,
input [1:0]s,
output reg [3:0]y
);
integer i;
always @(*)begin
    for(i=0;i<4;i=i+1)begin
        if(s==i)
        y[i]<=d;
        else
        y[i]=1'b0;
    end
end
endmodule