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

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Author: pre-commit-ci[bot]

sorts/pancake_sort.py

@@ -1,4 +1,4 @@
-# sorts/pancake_sort.py   
+# sorts/pancake_sort.py
 """
 This is a pure Python implementation of the pancake sort algorithm
 For doctests run following command:
@@ -60,4 +60,3 @@ def pancake_sort(arr: Sequence[T]) -> list[T]:
     user_input = input("Enter numbers separated by a comma:\n").strip()
     unsorted = [int(item) for item in user_input.split(",")]
     print(f"{pancake_sort(unsorted) = }")
-