62. Nibble Swap

How do you plan to solve it?

module nibble_swap_task(
    input  wire [7:0] x,
    output reg  [7:0] y
);

    // -------------------------------
    // Task: extract high + low nibble
    // -------------------------------
    task swap_nibbles(
        input  [7:0] xin,
        output [3:0] hi,
        output [3:0] lo
    );
        begin
            hi = xin[7:4];   // high nibble
            lo = xin[3:0];   // low nibble
        end
    endtask

    // Temporary nibble storage
    reg [3:0] hi_nib, lo_nib;

    // -------------------------------
    // Combinational logic block
    // -------------------------------
    always @(*) begin
        swap_nibbles(x, hi_nib, lo_nib);    // call task
        y = {lo_nib, hi_nib};               // swap positions
    end

endmodule