diff --git a/.vscode/student.dart b/.vscode/student.dart
deleted file mode 100644
index 6ae40e1..0000000
--- a/.vscode/student.dart
+++ /dev/null
@@ -1,36 +0,0 @@
-//parent class
-class Teacher {
-  String name = '';
-  String position = '';
-  int age = 0;
-
-  Teacher(String name, String position, int age) {
-    this.name = name;
-    this.age = age;
-    this.position = position;
-
-    void display() {
-      print(
-          'Name of teacher is $name , position is $position and his age is $age');
-    }
-  }
-}
-
-//child class
-//TODO1 : declare the class
-class Student extends Teacher {
-//TODO2: DECLARE THE PROPERTIES
-
-//TODO3: DECLARE THE CONSTRUCTOR
-  Student(String name, String position, int age) : super(name, position, age) {}
-//TODO 4: DECLARE THE METHODS
-  @override
-  void display() {
-    print('Name of student is $name and his age is $age');
-  }
-}
-
-void main() {
-  Student s1 = Student('binod', 'head', 23);
-  s1.display();
-}
diff --git a/student.dart b/student.dart
new file mode 100644
index 0000000..6a7792f
--- /dev/null
+++ b/student.dart
@@ -0,0 +1,32 @@
+//parent class or super class
+class Teacher {
+  String name;
+  String position;
+  int age;
+
+  Teacher({
+    this.name = '',
+    this.position = '',
+    this.age = 0,
+  });
+
+  void display() {
+    print(
+        'Name of teacher is $name , position is $position and his age is $age');
+  }
+}
+
+//child class or base class
+
+class Student extends Teacher {
+  Student(String name, int age) : super(name: name, age: age) {}
+
+  void display() {
+    print('Name of student is $name and his age is $age');
+  }
+}
+
+void main() {
+  Student s1 = Student('binod', 23);
+  s1.display();
+}