diff --git a/Lesson_5/Task_1/Interfaces/IValidation.cs b/Lesson_5/Task_1/Interfaces/IValidation.cs
new file mode 100644
index 0000000..4c04bb5
--- /dev/null
+++ b/Lesson_5/Task_1/Interfaces/IValidation.cs
@@ -0,0 +1,6 @@
+namespace Lesson5.Interfaces;
+
+public interface IValidation
+{
+    static string Check(string source, string destination) => throw new NotImplementedException();
+}