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

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Author: pre-commit-ci[bot]

maths/factorial.py

@@ -1,6 +1,7 @@
 """
 Factorial of a positive integer -- https://en.wikipedia.org/wiki/Factorial
 """
+
 """
 Implementation of factorial algorithms (iterative and recursive).
 
@@ -10,6 +11,7 @@
 - Type hints
 """
 
+
 def factorial(number: int) -> int:
     """
     Calculate the factorial of specified number (n!).