strings/join.py is incorrect

[osman-haider]

Repository commit

3b1b70bf0e60dddb14917dd7cad34a41d429df01

Python version (python --version)

Python 3.10

Dependencies version (pip freeze)

n/a

Expected behavior

s = ["", "", ""] join(",", s) == ",".join(s)

',,' == ',,'

Actual behavior

s = ["", "", ""] join(",", s) == ",".join(s)

'' != ',,'