from typing import List


def list_to_comma_sep_str(list_of_str: List[str]) -> str:
    """
    Join a list of strings into one comma-seperated string.

    Args:
        list_of_str: A list of strings to concatenate

    Returns
        The concatenated string

    """
    if len(list_of_str) == 0:
        return ""
    return ",".join(list_of_str)