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);
    // Write code here
    
endmodule

// Full Adder using 2 Half Adders
module full_adder_struct (
    input  a, b, cin,
    output sum, cout
);
wire sum1,cin1,cin2;
half_adder ha1(.a(a),.b(b),.sum(sum1),.carry(cin1));
half_adder ha2(.a(sum1),.b(cin),.sum(sum),.carry(cin2));
or (cout,cin1,cin2);
endmodule