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
);
    assign sum= a^b^cin;
    assign cout= (a&b)|(b&cin)|(a&cin);


endmodule