Program.cs

using Exercise_01_WorkerContracts.Entities;
using Exercise_01_WorkerContracts.Entities.Enums;
using System;
using System.Globalization;

namespace Exercise_01_WorkerContracts
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.Write("Enter department's name: ");
            string deptName = Console.ReadLine();
            Console.WriteLine("Enter worker data: ");
            Console.Write("Name: ");
            string name = Console.ReadLine();
            Console.Write("Level (Junior/MidLevel/Senior): ");
            WorkerLevel level = Enum.Parse<WorkerLevel>(Console.ReadLine());
            Console.Write("Base salary: ");
            double baseSalary = double.Parse(Console.ReadLine(), CultureInfo.InvariantCulture);

            Department dept = new Department(deptName);
            Worker worker = new Worker(name, level, baseSalary, dept);

            Console.Write("How many contracts to this employ? ");
            int n = int.Parse(Console.ReadLine());

            for (int i = 1; i <= n; i++)
            {
                Console.WriteLine($"Enter #{i} contract data: ");

                Console.Write("Date (DD/MM/YYYY): ");
                DateTime date = DateTime.Parse(Console.ReadLine());

                Console.Write("Value per hour: ");
                double valuePerHour = double.Parse(Console.ReadLine(), CultureInfo.InvariantCulture);

                Console.Write("Duration (hours): ");
                int hours = int.Parse(Console.ReadLine());

                HourContract contract = new HourContract(date, valuePerHour, hours);
                worker.AddContract(contract);
            }
            
            Console.WriteLine();
            Console.Write("Enter month and year to calculate income (MM/YYYY): ");
            string monthAndYear = Console.ReadLine();
            int month = int.Parse(monthAndYear.Substring(0,2));
            int year = int.Parse(monthAndYear.Substring(3));

            Console.WriteLine("Name: " + worker.Name);
            Console.WriteLine("Departament: " + worker.Departament.Name);
            Console.WriteLine("Income for " + monthAndYear + ": " + worker.Income(year, month).ToString("F2",CultureInfo.InvariantCulture));

        }
    }
}