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
    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
);
    // Write code here
    wire sTemp1, carryTemp1, sTemp2, carryTemp2;
    half_adder half_adder1(a, b, sTemp, carryTemp);
    half_adder half_adder2(sTemp, cin, sTemp2, carryTemp2);
    assign sum = sTemp2;
    or (cout, carryTemp, carryTemp2);
endmodule