Update print_family_tree to print descendants recursively

Author: ike-agu

prep_exercise/6_generics.py

@@ -13,8 +13,8 @@ class Person:
 imran = Person(name="Imran", age = 33, children=[fatma, aisha])
 
 def print_family_tree(person: Person) -> None:
-    print(person.name)
+    print(f"- {person.name} ({person.age})")
     for child in person.children:
-        print(f"- {child.name} ({child.age})")
+        print_family_tree(child)
 
 print_family_tree(imran)