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(a), .b(b), .sum(w1), .carry(w2));
half_adder ha2(.a(w1), .b(cin), .sum(sum), .carry(w3));
or or1 (cout, w2, w3);
endmodule