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 sum0, c0, c1;
    half_adder ha0 (.a(a), .b(b), .sum(sum0) , .carry(c0));
    half_adder ha1 (.a(sum0), .b(cin), .sum(sum) , .carry(c1));
    assign cout = c0 | c1;
endmodule