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 w1,w2,w3;
half_adder u1(.a(a),.b(b),.sum(w1),.carry(w2));
half_adder u2(.a(w1),.b(cin),.sum(sum),.carry(w3));
assign cout=w3|w2;
endmodule