17. Binary to Gray Code Converter

How do you plan to solve it?

module bin2gray4(
input [3:0] bin_in,
output [3:0] gray_out
);
    assign gray_out = {bin_in[3], (bin_in[3] ^ bin_in[2]), (bin_in[2]^bin_in[1]), (bin_in[1]^bin_in[0])};

endmodule