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
);

wire c1, s1, c2;

half_adder u1( .a(a), .b(b), .sum(s1), .carry(c1) );
half_adder u2( .a(s1), .b(cin), .sum(sum), .carry(c2) );

assign cout = c1 | c2;

endmodule