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