Problem_6_Students_part2._Лаб_Classes

using System;
using System.Linq;
using System.Collections.Generic;

namespace Problem_6_Students_part2._Лаб_Classes
{
    class Program
    {
        static void Main(string[] args)
        {
            string input = Console.ReadLine();

            List<Student> students = new List<Student>();

            while (input != "end")
            {
                string[] data = input
                    .Split(" ")
                    .ToArray();

                string firstName = data[0];
                string lastName = data[1];
                int age = int.Parse(data[2]);
                string hometown = data[3];

                Student student = new Student();

                if (IsExistingStudent(students, firstName, lastName))
                {

                    student = GetStudent(students, firstName, lastName);
                    student.FirstName = firstName;
                    student.LastName = lastName;
                    student.Age = age;
                    student.HomeTown = hometown;

                }
                else
                {
                    student.FirstName = firstName;
                    student.LastName = lastName;
                    student.Age = age;
                    student.HomeTown = hometown;

                    students.Add(student);
                }


                input = Console.ReadLine();
            }

            string homeTown = Console.ReadLine();

            List<Student> FiltredStudents = students
                .Where(x => x.HomeTown == homeTown)
                .ToList();

            foreach (Student student in FiltredStudents)
            {
                Console.WriteLine($"{student.FirstName} {student.LastName} is {student.Age} years old.");
            }
        }

        static bool IsExistingStudent(List<Student> students, string firstName, string lastName)
        {

            foreach (Student student in students)
            {
                if (firstName == student.FirstName && lastName == student.LastName)
                {
                    return true;
                }
            }

            return false;


        }

        static Student GetStudent(List<Student> students, string firstName, string lastName)
        {
            Student existingStudent = null;

            foreach (Student student in students)
            {
                if (firstName == student.FirstName && lastName == student.LastName)
                {
                    existingStudent = student;
                }
            }
            return existingStudent;

        }

    }

 class Student
    {
        public string FirstName { get; set; }

        public string LastName { get; set; }

        public int Age { get; set; }

        public string HomeTown { get; set; }
    }
}