Fix doctest formatting

Author: Shreya

sorts/pancake_sort.py

@@ -8,7 +8,7 @@
 python pancake_sort.py
 """
 
-
+from __future__ import annotations
 def pancake_sort(arr):
     """Sort Array with Pancake Sort.
     :param arr: Collection containing comparable items
@@ -20,6 +20,9 @@ def pancake_sort(arr):
     []
     >>> pancake_sort([-2, -5, -45])
     [-45, -5, -2]
+    
+    Time Complexity: (O(n^2)) 
+    Space Complexity: (O(n))
     """
     cur = len(arr)
     while cur > 1:
@@ -32,8 +35,6 @@ def pancake_sort(arr):
         cur -= 1
     return arr
 
-
 if __name__ == "__main__":
-    user_input = input("Enter numbers separated by a comma:\n").strip()
-    unsorted = [int(item) for item in user_input.split(",")]
-    print(pancake_sort(unsorted))
+    import doctest
+    doctest.testmod()