64. Full Adder

How do you plan to solve it?

// Half Adder primitive
module half_adder (
    input  a, b,
    output sum, carry
);
    xor(sum, a, b);
    and(carry, a, b);
    
endmodule

// Full Adder using 2 Half Adders
module full_adder_struct (
    input  a, b, cin,
    output sum, cout
);
    wire sum_c, carry_c, sum_c2, carry_c2;
    half_adder first (.a(a), .b(b), .sum(sum_c), .carry(carry_c)) ;
    half_adder second (.a(sum_c), .b(cin), .sum(sum), .carry(carry_c2));
    or (cout, carry_c2, carry_c);


endmodule