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 w1, w2, w3;
    half_adder a1 ( .a( a ), .b( b ), .sum( w1 ), .carry( w2 ) );
    half_adder a2 ( .a( w1 ), .b( cin ), .sum( sum ), .carry( w3 ) );
    assign cout = w3 | w2;

endmodule