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

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

Author: pre-commit-ci[bot]

ciphers/gronsfeld.py

@@ -1,54 +1,54 @@
 def gronsfeld_encrypt(plaintext, key):
     """
     Encrypts a plaintext using the Gronsfeld cipher.
-    
+
     Parameters:
     plaintext (str): The message to be encrypted.
     key (str): A numeric key used for encryption (e.g., "31415").
-    
+
     Returns:
     str: The encrypted message.
     """
     ciphertext = ""
     key = [int(k) for k in key]
     key_length = len(key)
-    
+
     for i, letter in enumerate(plaintext):
         if letter.isalpha():
             shift = key[i % key_length]
-            base = ord('A') if letter.isupper() else ord('a')
+            base = ord("A") if letter.isupper() else ord("a")
             # Shift and wrap around the alphabet
             ciphertext += chr((ord(letter) - base + shift) % 26 + base)
         else:
             ciphertext += letter
-    
+
     return ciphertext
 
 
 def gronsfeld_decrypt(ciphertext, key):
     """
     Decrypts a ciphertext using the Gronsfeld cipher.
-    
+
     Parameters:
     ciphertext (str): The message to be decrypted.
     key (str): A numeric key used for decryption (e.g., "31415").
-    
+
     Returns:
     str: The decrypted message.
     """
     plaintext = ""
     key = [int(k) for k in key]
     key_length = len(key)
-    
+
     for i, letter in enumerate(ciphertext):
         if letter.isalpha():
             shift = key[i % key_length]
-            base = ord('A') if letter.isupper() else ord('a')
+            base = ord("A") if letter.isupper() else ord("a")
             # Reverse the shift to decrypt
             plaintext += chr((ord(letter) - base - shift) % 26 + base)
         else:
             plaintext += letter
-    
+
     return plaintext