using System;

​

public class Program

{

    public static void Main()

    {

        var s1 = new Student(new Name("A"));

        var s2 = new Student(new Name("A"));

        Console.WriteLine(s1.Equals(s2).ToString());

        var s3 = new Student(new Name("A"));

        var s4 = s3;

        Console.WriteLine(s3.Equals(s4).ToString());

    }

}

​

public class Student : IEquatable<Student>

{

    public Name Name { get; }

​

    public Student(Name name) => Name = name;

    public bool Equals(Student other)

    {

        if (ReferenceEquals(this, other))

            return true;

        if (ReferenceEquals(other, null))

            return false;

        return Name == (other.Name);

    }

}

​

public class Name : IEquatable<Name>

{

    public string First { get; }

​

    public Name(string first) => First = first;

    public bool Equals(Name other)

    {

        if (ReferenceEquals(this, other))

            return true;

        if (ReferenceEquals(other, null))

            return false;

        return First == other.First;

    }

    public static bool operator == (Name a, Name b)

    {

        return a.First == b.First;

    }

    public static bool operator != (Name a, Name b)

    {

        return a.First != b.First;

    }

}