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

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

Author: pre-commit-ci[bot]

maths/series/catalan_numbers.py

@@ -70,8 +70,8 @@ def catalan_numbers(count: int) -> list[int]:
     try:
         num = int(input("Enter the number of Catalan numbers to generate: "))
         if num < 0:
-             print("Please enter a non-negative integer.")
+            print("Please enter a non-negative integer.")
         else:
             print(f"The first {num} Catalan numbers are: {catalan_numbers(num)}")
     except ValueError:
-        print("Invalid input. Please enter an integer.")
+        print("Invalid input. Please enter an integer.")