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


module full_adder_struct (
    input  a, b, cin,
    output sum, cout
);
 wire sum1,carry1,carry2;
 half_adder ha1(a,b,sum1,carry1);
 half_adder ha2(sum1,cin,sum,carry2);
assign cout = carry1 | carry2;

endmodule