66. Demultiplexer

How do you plan to solve it?

//==================================================
// Module: demux1to4
// Description: 1-to-4 Demultiplexer (Combinational)
//==================================================

module demux1to4 (
    input  wire d,
    input  wire [1:0] s,
    output reg  [3:0] y
);

    always @* begin
        // Default all outputs to 0
        y = 4'b0000;

        // Route input 'd' to selected output line
        case (s)
            2'b00: y[0] = d;
            2'b01: y[1] = d;
            2'b10: y[2] = d;
            2'b11: y[3] = d;
            default: y = 4'b0000;
        endcase
    end

endmodule