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
);
    wire w1, w2, w3;
    // Write code here
    half_adder HA1 (.a(a), .b(b), .sum(w1), .carry(w2));
    half_adder HA2 (.a(w1), .b(cin), .sum(sum), .carry(w3));
    assign cout = w3 | w2;
endmodule