Optimized recursive_bubble_sort (#2410)

* optimized recursive_bubble_sort

* Fixed doctest error due whitespace

* reduce loop times for optimization

* fixup! Format Python code with psf/black push

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

backtracking/all_permutations.py

@@ -13,10 +13,10 @@ def generate_all_permutations(sequence):
 
 def create_state_space_tree(sequence, current_sequence, index, index_used):
     """
-        Creates a state space tree to iterate through each branch using DFS.
-        We know that each state has exactly len(sequence) - index children.
-        It terminates when it reaches the end of the given sequence.
-        """
+    Creates a state space tree to iterate through each branch using DFS.
+    We know that each state has exactly len(sequence) - index children.
+    It terminates when it reaches the end of the given sequence.
+    """
 
     if index == len(sequence):
         print(current_sequence)