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[3]=bin_in[3];
    assign gray_out[2]=bin_in[3]^bin_in[2];
    assign gray_out[1]=bin_in[2]^bin_in[1];
    assign gray_out[0]=bin_in[1]^bin_in[0];
endmodule