Validation classes complited

UniversityAllExpelledClient/UniversityAllExpelled_Models/Exceptions/ValidationExctption.cs

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+
+namespace UniversityAllExpelled_Models.Exceptions;
+
+public class ValidationException(string message) : Exception(message)
+{
+    
+}

UniversityAllExpelledClient/UniversityAllExpelled_Models/Extensions/StringExtansions.cs

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+
+namespace UniversityAllExpelled_Models.Extensions;
+
+public static class StringExtensions
+{
+    public static bool IsEmpty(this string str)
+    {
+        return string.IsNullOrWhiteSpace(str);
+    }
+
+    public static bool IsGuid(this string str)
+    {
+        return Guid.TryParse(str, out _);
+    }
+}

UniversityAllExpelledClient/UniversityAllExpelled_Models/Infrostructure/IValidation.cs

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+
+namespace UniversityAllExpelled_Models.Infrostructure;
+
+public interface IValidation
+{
+    void Validate();
+}