resolve nip and phoneNumber problem

src/InternshipSystem.Core/Entity/Company.cs

@@ -6,13 +6,13 @@ namespace InternshipSystem.Core
     public class Company
     {
         public long Id { get; set; }
-        public Nip Nip { get; set; }
+        public string Nip { get; set; }
         public string Name { get; set; }
         public RangeOfActivity Range { get; set; }
         public List<BranchOffice> Branches { get; set; }
         public Uri SiteAddress { get; set; }
 
-        public Company CreateCompany(Nip nip, RangeOfActivity range, string name)
+        public Company CreateCompany(string nip, RangeOfActivity range, string name)
         {
             return new Company
             {

src/InternshipSystem.Core/ValueObject/Mentor.cs

@@ -5,6 +5,6 @@
         public string FirstName { get; set; }
         public string LastName { get; set; }
         public string Email { get; set; }
-        public PhoneNumber PhoneNumber { get; set; }
+        public string PhoneNumber { get; set; }
     }
 }

src/InternshipSystem.Core/ValueObject/Nip.cs

@@ -1,22 +0,0 @@
-namespace InternshipSystem.Core
-{
-    public class Nip
-    {
-        private readonly string nip;
-        
-        public Nip()
-        {
-        }
-
-        private Nip(string maybeNip)
-        {
-            nip = maybeNip;
-        }
-
-        public static implicit operator string(Nip nip) =>
-            nip.nip;
-
-        public static implicit operator Nip(string maybeNip) =>
-            new Nip(maybeNip);
-    }
-}

src/InternshipSystem.Core/ValueObject/PhoneNumber.cs

@@ -1,22 +0,0 @@
-namespace InternshipSystem.Core
-{
-    public class PhoneNumber
-    {
-        private readonly string phoneNumber;
-
-        public PhoneNumber()
-        {
-        }
-
-        private PhoneNumber(string maybePhoneNumber)
-        {
-            phoneNumber = maybePhoneNumber;
-        }
-
-        public static implicit operator string(PhoneNumber phoneNumber) =>
-            phoneNumber.phoneNumber;
-
-        public static implicit operator PhoneNumber(string maybephoneNumber) =>
-            new PhoneNumber(maybephoneNumber);
-    }
-}

src/InternshipSystem.Repository/InternshipDbContext.cs

@@ -25,11 +25,7 @@ namespace InternshipSystem.Repository
                 .OwnsOne(bo => bo.Address);
 
             modelBuilder.Entity<InternshipProgram>()
-                .OwnsOne(ip => ip.Mentor)
+                .OwnsOne(ip => ip.Mentor);
-                .OwnsOne(m => m.PhoneNumber);
-
-            modelBuilder.Entity<Company>()
-                .OwnsOne(c => c.Nip);
 
             modelBuilder.Entity<ProgramSubject>(builder =>
             {