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
);
    wire p,q,r;
    half_adder ha1 (a,b,p,q);
    half_adder ha2 (p,cin,sum,r);
    assign cout = q | r;

endmodule