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 carry1, carry2, sum1;
    half_adder ha1(a, b, sum1, carry1);
    half_adder ha2(sum1, cin, sum, carry2); 
    or(cout, carry2, carry1);
endmodule