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
);
wire sum1;
wire carry1;
wire carry2;
    // Write code here
    half_adder ha1(a,b,sum1,carry1);
    half_adder ha2(sum1,cin,sum,carry2);
    assign cout = carry2| carry1;

endmodule