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
);

    wire sum_ha1, c_ha1, c_ha2;

    // Write code here
    half_adder ha1 (
        .a(a), 
        .b(b),
        .sum(sum_ha1), 
        .carry(c_ha1)
    );

    half_adder ha2 (
        .a(sum_ha1), 
        .b(cin),
        .sum(sum), 
        .carry(c_ha2)
    );

    assign cout = c_ha2 | c_ha1;

endmodule