Вытащил солюшен на уровень выше, чтобы прощё было дотнетить

ApplicationLayer/Services/VisaApplications/Models/VisaApplicationModel.cs

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+using System.ComponentModel.DataAnnotations;
+using System.Text;
+using ApplicationLayer.Services.Applicants.Models;
+using Domains.VisaApplicationDomain;
+
+namespace ApplicationLayer.Services.VisaApplications.Models;
+
+/// Model of <see cref="VisaApplication" /> with applicant property
+public class VisaApplicationModel
+{
+    /// <inheritdoc cref="VisaApplication.Id" />
+    [Required]
+    public Guid Id { get; set; }
+
+    /// Applicant of application
+    [Required]
+    public ApplicantModel Applicant { get; set; } = null!;
+
+    /// <inheritdoc cref="VisaApplication.Status" />
+    [Required]
+    public ApplicationStatus Status { get; set; }
+
+    /// <inheritdoc cref="VisaApplication.ReentryPermit" />
+    public ReentryPermitModel? ReentryPermit { get; set; }
+
+    /// <inheritdoc cref="VisaApplication.DestinationCountry" />
+    [Required]
+    public string DestinationCountry { get; set; } = null!;
+
+    /// <inheritdoc cref="VisaApplication.PastVisas" />
+    [Required]
+    public List<PastVisaModel> PastVisas { get; set; } = null!;
+
+    /// <inheritdoc cref="VisaApplication.PermissionToDestCountry" />
+    public PermissionToDestCountryModel? PermissionToDestCountry { get; set; }
+
+    [Required] public List<PastVisitModel> PastVisits { get; set; } = null!;
+
+    /// <inheritdoc cref="VisaApplication.VisaCategory" />
+    [Required]
+    public VisaCategory VisaCategory { get; set; }
+
+    /// <inheritdoc cref="VisaApplication.ForGroup" />
+    [Required]
+    public bool ForGroup { get; set; }
+
+    /// <inheritdoc cref="VisaApplication.RequestedNumberOfEntries" />
+    [Required]
+    public RequestedNumberOfEntries RequestedNumberOfEntries { get; set; }
+
+    /// <inheritdoc cref="VisaApplication.RequestDate" />
+    [Required]
+    public DateTime RequestDate { get; set; }
+
+    /// <inheritdoc cref="VisaApplication.ValidDaysRequested" />
+    [Required]
+    public int ValidDaysRequested { get; set; }
+
+    public string ForGroupToString() => ForGroup ? "For group" : "Individual";
+
+    public string PastVisasToString()
+    {
+        var stringBuilder = new StringBuilder();
+        foreach (var visa in PastVisas)
+        {
+            stringBuilder.AppendLine($"{visa.Name} issued at {visa.IssueDate.ToShortDateString()} and valid for {visa.ExpirationDate.ToShortDateString()}");
+        }
+
+        return stringBuilder.ToString();
+    }
+
+    public string PastVisitsToString()
+    {
+        var stringBuilder = new StringBuilder();
+        foreach (var visit in PastVisits)
+        {
+            stringBuilder.AppendLine($"Visit to {visit.DestinationCountry} started at {visit.StartDate.ToShortDateString()} and ends {visit.EndDate.ToShortDateString()}");
+        }
+
+        return stringBuilder.ToString();
+    }
+
+    public string PermissionToDestCountryToString()
+    {
+        return VisaCategory is VisaCategory.Transit
+            ? $"Issued by{PermissionToDestCountry!.Issuer}, expires at {PermissionToDestCountry.ExpirationDate.ToShortDateString()}"
+            : "Non-transit";
+    }
+}