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 w1, w2, w3;
assign w1=bin_in[2]^bin_in[3];
assign w2=bin_in[1]^bin_in[2];
assign w3=bin_in[0]^bin_in[1];

assign gray_out[3]=bin_in[3];
assign gray_out[2]=w1;
assign gray_out[1]=w2;
assign gray_out[0]=w3;
endmodule