style: format code with Autopep8, Black, ClangFormat, dotnet-format, …

…Go fmt, Gofumpt, Google Java Format, isort, Ktlint, PHP CS Fixer, Prettier, RuboCop, Ruff Formatter, Rustfmt, Scalafmt, StandardJS, StandardRB, swift-format and Yapf

This commit fixes the style issues introduced in d0a8368 according to the output
from Autopep8, Black, ClangFormat, dotnet-format, Go fmt, Gofumpt, Google Java
Format, isort, Ktlint, PHP CS Fixer, Prettier, RuboCop, Ruff Formatter, Rustfmt,
Scalafmt, StandardJS, StandardRB, swift-format and Yapf.

Details: None

core/credit_card/management.py

@@ -1,5 +1,6 @@
 import datetime
 
+
 class CreditCard:
     def __init__(self, card_number, limit):
         self.card_number = card_number
@@ -8,6 +9,7 @@ def __init__(self, card_number, limit):
         self.interest_rate = 0.05
         self.closed = False
 
+
 def process_payments():
     for card in all_cards:
         amount_due = card.balance * (1 + card.interest_rate)
@@ -16,33 +18,42 @@ def process_payments():
         else:
             card.balance = 0
 
+
 def process_purchases():
     for card in all_cards:
         if card.closed:
             continue
-        purchase_amount = float(input(f"Enter purchase amount for card {card.card_number}: "))
+        purchase_amount = float(
+            input(f"Enter purchase amount for card {card.card_number}: ")
+        )
         if purchase_amount > card.limit - card.balance:
             print(f"PURCHASE DENIED: Insufficient credit for card {card.card_number}")
         else:
             card.balance += purchase_amount
             if card.balance > card.limit:
                 print(f"WARNING: Credit limit exceeded for card {card.card_number}")
 
+
 def set_credit_limit(card, limit):
     card.limit = limit
 
+
 def get_credit_limit(card):
     return card.limit
 
+
 def get_balance(card):
     return card.balance
 
+
 def apply_interest(card):
-    card.balance *= (1 + card.interest_rate)
+    card.balance *= 1 + card.interest_rate
+
 
 def deny_credit(card):
     card.limit = 0
     card.closed = True
 
+
 # Initialize list of all credit cards
 all_cards = []