Remove extra trailing whitespace

Author: Susmita-Chakrabarty

pydatastructs/crypto/tests/test_chacha20.py

@@ -64,23 +64,23 @@ def test_key_reuse_simple():
     """
     Test the vulnerability of key reuse in ChaCha20 encryption.
 
-    This test demonstrates the security flaw of reusing the same key and nonce 
-    for different plaintexts in stream ciphers. It exploits the property that 
-    XORing two ciphertexts from the same keystream cancels out the keystream, 
-    revealing the XOR of the plaintexts. 
+    This test demonstrates the security flaw of reusing the same key and nonce
+    for different plaintexts in stream ciphers. It exploits the property that
+    XORing two ciphertexts from the same keystream cancels out the keystream,
+    revealing the XOR of the plaintexts.
 
     Encrypt two different plaintexts with the same key and nonce.
     XOR the resulting ciphertexts to remove the keystream, leaving only the XOR of plaintexts.
     XOR the result with the first plaintext to recover the second plaintext.
     Assert that the recovered plaintext matches the original second plaintext.
 
     Expected Behavior:
-    - If the ChaCha20 implementation is correct, reusing the same key and nonce 
+    - If the ChaCha20 implementation is correct, reusing the same key and nonce
       will expose the XOR relationship between plaintexts.
     - The test should successfully recover the second plaintext using XOR operations.
 
     Assertion:
-    - Raises an AssertionError if the recovered plaintext does not match the 
+    - Raises an AssertionError if the recovered plaintext does not match the
       original second plaintext, indicating a failure in the XOR recovery logic.
 
     Output:
@@ -89,11 +89,11 @@ def test_key_reuse_simple():
     - Displays the XOR result (hexadecimal format) for inspection.
 
     Security Note:
-    - This test highlights why it is critical never to reuse the same key and nonce 
+    - This test highlights why it is critical never to reuse the same key and nonce
       in stream ciphers like ChaCha20.
     """
 
-    
+
     cipher1 = ChaCha20(VALID_KEY, VALID_NONCE)
     cipher2 = ChaCha20(VALID_KEY, VALID_NONCE)