❔ which is the key for write a good code? my 1st exercise of advent of calendar

namespace AOC_2015_1
{
    internal class Program
    {
        static short floor = 0;
        static string? input;

        static void Main(string[] args)
        {
            Console.WriteLine("Where should I delivery the next gift?");
            input = Console.ReadLine();
            gift_delivery(input);
        }
        
        static void gift_delivery(string input)
        {
            char floorUp = '(';
            char floorDown = ')';
            
            foreach (char c in input)
            {
                if (c == floorUp)
                {
                    floor++;
                }
                else if (c == floorDown) {
                    floor--;
                }
            }
            Console.WriteLine($"Final floor is {floor}");
        }
    }
}

namespace AOC_2015_1
{
    internal class Program
    {
        static short floor = 0;
        static string? input;

        static void Main(string[] args)
        {
            Console.WriteLine("Where should I delivery the next gift?");
            input = Console.ReadLine();
            gift_delivery(input);
        }
        
        static void gift_delivery(string input)
        {
            char floorUp = '(';
            char floorDown = ')';
            
            foreach (char c in input)
            {
                if (c == floorUp)
                {
                    floor++;
                }
                else if (c == floorDown) {
                    floor--;
                }
            }
            Console.WriteLine($"Final floor is {floor}");
        }
    }
}