[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

divide_and_conquer/quicksort.py

@@ -9,7 +9,7 @@ def quicksort(arr: list) -> list:
     >>> quicksort([3, 6, 8, 10, 1, 2, 1, 3, 2, 8])
     [1, 1, 2, 2, 3, 3, 6, 8, 8, 10]
     """
-    
+
     # If the length of the array is less than or equal to 1, then there's
     # nothing to sort, so return the given array
     if len(arr) <= 1:
@@ -30,6 +30,8 @@ def quicksort(arr: list) -> list:
     # position of the element
     return quicksort(smaller_elements) + pivot_elements + quicksort(larger_elements)
 
+
 if __name__ == "__main__":
     import doctest
+
     doctest.testmod()