64. Full Adder

How do you plan to solve it?

// Half Adder primitive
module half_adder (
    input  a, b,
    output sum, carry
);
    // Write code here
    assign sum = a ^ b;
    assign carry = a & b;
endmodule

// Full Adder using 2 Half Adders
module full_adder_struct (
    input  a, b, cin,
    output sum, cout
);
    // Write code here
    wire w1,w2,w3;
    half_adder HA1(a,b,w1,w2);
    half_adder HA2(w1,cin,sum,w3);
    assign cout = w2 | w3;

endmodule