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 @(*)
    for (i = 0; i < 4; i = i + 1)
        y[i] = s == i ? d : 0;

endmodule