64. Full Adder

How do you plan to solve it?

// Half Adder primitive
module half_adder (
    input  a, b,
    output sum, carry
);
    // Write code here
    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
);
    // Write code here
    wire x,y,z;
    half_adder ha1(a,b,x,y);
    half_adder ha2(x,cin,sum,z);
    assign cout=y|z;


endmodule