64. Full Adder

How do you plan to solve it?

// Half Adder primitive
module half_adder (
    input  a, b,
    output sum, carry
);
    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
);
    half_adder u_b0 (
        .a(a),
        .b(b),
        .sum(a0),
        .carry(c0)
    );

    half_adder u_out (
        .a(a0),
        .b(cin),
        .sum(sum),
        .carry(c1)
    );

    assign cout = c1 | c0;


endmodule