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
);
    // Write code here
    wire s1,c1,c2;
    half_adder h1(a,b,s1,c1);
    half_adder h2(s1,cin,sum,c2);
    assign cout = c1 | c2;
endmodule