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

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Author: pre-commit-ci[bot]

maths/factorial.py

@@ -5,13 +5,13 @@
 
 def factorial(number: int) -> int:
     """
-  
+
     Calculate the factorial of a non-negative integer.
 
     :param n: non-negative integer
     :return: factorial of n
     :raises ValueError: if n is negative
-    
+
     """
     if number != int(number):
         raise ValueError("factorial() only accepts integral values")