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 fd4163d 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

transaction_processing/transaction_routing.py

@@ -1,18 +1,20 @@
 class TransactionRouter:
     def __init__(self):
         self.routing_rules = {
-            'domestic': {
-                'regex': r'^\d{10}$',
-                'message': 'Invalid account number format. Please enter a 10-digit account number.'
+            "domestic": {
+                "regex": r"^\d{10}$",
+                "message": "Invalid account number format. Please enter a 10-digit account number.",
+            },
+            "international": {
+                "regex": r"^\d{12}$",
+                "message": "Invalid account number format. Please enter a 12-digit account number.",
             },
-            'international': {
-                'regex': r'^\d{12}$',
-                'message': 'Invalid account number format. Please enter a 12-digit account number.'
-            }
         }
 
     def route_transaction(self, transaction):
         for rule in self.routing_rules:
-            if re.match(self.routing_rules[rule]['regex'], transaction['account_number']):
+            if re.match(
+                self.routing_rules[rule]["regex"], transaction["account_number"]
+            ):
                 return rule
-        raise ValueError('Invalid account number format.')
+        raise ValueError("Invalid account number format.")