Fix split function to handle trailing delimiters correctly (#12423)

* Fix split function to handle trailing delimiters correctly

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

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* Update split.py

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Maxim Smolskiy <mithridatus@mail.ru>

Author: 3 people

strings/split.py

@@ -14,6 +14,9 @@ def split(string: str, separator: str = " ") -> list:
 
     >>> split("12:43:39",separator = ":")
     ['12', '43', '39']
+
+    >>> split(";abbb;;c;", separator=';')
+    ['', 'abbb', '', 'c', '']
     """
 
     split_words = []
@@ -23,7 +26,7 @@ def split(string: str, separator: str = " ") -> list:
         if char == separator:
             split_words.append(string[last_index:index])
             last_index = index + 1
-        elif index + 1 == len(string):
+        if index + 1 == len(string):
             split_words.append(string[last_index : index + 1])
     return split_words