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