Add Lesson 2 Task 4

Lesson_2/Task_4/Program.cs

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+/*
+* Lesson 2 Task 4: get two collections with cars and their owners and ask car number, then return its owner's name and address
+* Author: Stanislav Mykhailenko
+* License: Unlicense
+*/
+
+List<Owner> owners = new List<Owner>()
+{
+    new Owner(1, "Tom", "Street 1"),
+    new Owner(2, "Bob", "Street 2"),
+    new Owner(3, "Sam", "Street 3"),
+};
+
+List<Car> cars = new List<Car>()
+{
+    new Car("123ABC", 1),
+    new Car("456DEF", 2),
+    new Car("789GHI", 3),
+};
+
+string? number;
+
+do
+{
+	Console.Write("Enter number: ");
+	number = Console.ReadLine();
+} while (number == null);
+
+var selected = owners.FirstOrDefault(x => cars.Any(y => y.Number == number && y.OwnerID == x.ID));
+
+Console.WriteLine(selected);
+
+class Owner
+{
+	public int ID { get;}
+	public string Name { get;}
+	public string Address { get;}
+
+	public override string ToString()
+	{
+		return "Name: " + Name + ", Address: " + Address;
+	}
+
+	public Owner(int id, string name, string address)
+	{
+		ID = id;
+		Name = name;
+		Address = address;
+	}
+}
+
+class Car
+{
+	public string Number { get;}
+	public int OwnerID { get;}
+
+	public override string ToString()
+	{
+		return "Number: " + Number + ", Owner ID: " + OwnerID;
+	}
+
+	public Car(string number, int ownerid)
+	{
+		Number = number;
+		OwnerID = ownerid;
+	}
+}

Lesson_2/Task_4/Task_4.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>