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 sum_ha_1, carry_ha_1, carry_ha_2;
    half_adder ha_1 (.a(a), .b(b), .sum(sum_ha_1), .carry(carry_ha_1));
    half_adder ha_2 (.a(sum_ha_1), .b(cin), .sum(sum), .carry(carry_ha_2));
    assign cout = carry_ha_1 | carry_ha_2;
endmodule