update lesson labels to not display when completed

src/main/java/seedu/address/model/student/Lesson.java

@@ -146,6 +146,6 @@ public int hashCode() {
      * Format state as text for viewing.
      */
     public String toString() {
-        return '[' + value + ']';
+        return this.subject + "  " + this.date.toString() + "  " + this.time;
     }
 }

src/main/java/seedu/address/ui/StudentCard.java

@@ -60,7 +60,7 @@
         subject.setText(student.getSubject().value);
         remark.setText(student.getRemark().value);
         student.getLessons().stream()
-                .sorted(Comparator.comparing(Lesson::getLessonValue))
-                .forEach(lesson -> lessons.getChildren().add(new Label(lesson.getLessonValue())));
+                .sorted(Comparator.comparing(Lesson::getLessonValue)).filter(lesson -> lesson.getLessonStatus() == 0)
+                .forEach(lesson -> lessons.getChildren().add(new Label(lesson.toString())));
     }
 }

src/test/java/seedu/address/model/student/LessonTest.java

@@ -56,4 +56,19 @@ public void equals() {
         // different values -> returns false
         assertFalse(lesson.equals(new Lesson("Science|01-01-2023|09:00|0")));
     }
+
+    @Test
+    public void getLessonStatusIsValid() {
+        Lesson lesson1 = new Lesson("Math|01-01-2023|09:00|0");
+        assertEquals(lesson1.getLessonStatus(), 0);
+
+        Lesson lesson2 = new Lesson("Math|01-01-2023|09:00|1");
+        assertEquals(lesson2.getLessonStatus(), 1);
+    }
+
+    @Test
+    public void toStringTest() {
+        Lesson lesson = new Lesson("Math|01-01-2023|09:00|0");
+        assertEquals(lesson.toString(), "Math  2023-01-01  09:00");
+    }
 }