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 s1,c1,carry;
    half_adder ob1(a,b,s1,c1);
    half_adder ob2(s1,cin,sum,carry);
    assign cout=carry|c1;
    // Write code here
    
endmodule