17. Binary to Gray Code Converter

How do you plan to solve it?

/*Write your code here*/
module bin2gray4(
    input [3:0]bin_in,
    output [3:0]gray_out
);
wire a,b,c,d;
assign a=bin_in[3];
assign b=bin_in[3]^bin_in[2];
assign c=bin_in[2]^bin_in[1];
assign d=bin_in[1]^bin_in[0];
assign gray_out={a,b,c,d};
endmodule