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

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

Author: pre-commit-ci[bot]

strings/split.py

@@ -20,7 +20,7 @@ def split(string: str, separator: str = " ") -> list:
     """
 
     split_words = []
-    if(len(separator)>1):
+    if len(separator) > 1:
         raise ValueError("Separator must be a single character")
 
     last_index = 0