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

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

Author: pre-commit-ci[bot]

ciphers/rot13.py

@@ -10,15 +10,15 @@ def dencrypt(s: str) -> str:
     True
     """
     out = []
-    n=13
+    n = 13
     for c in s:
         if "A" <= c <= "Z":
             out += chr(ord("A") + (ord(c) - ord("A") + n) % 26)
         elif "a" <= c <= "z":
             out += chr(ord("a") + (ord(c) - ord("a") + n) % 26)
         else:
             out += c
-    return ''.join(out)
+    return "".join(out)
 
 
 def main() -> None: