def make_str_from_list(x,sep = ','):
    """
    Parameters
    ----------
    x : list  
        list of string
    sep : str
        separator to join strings with

    Returns 
    -------
    str

    Examples 
    --------
    >>> make_str_from_list(['V1','CASAAAF'], ',')
    'V1,CASAAAF'
    >>> make_str_from_list(['V1','CASAAAF'], '+')
    'V1+CASAAAF'
    """
    return sep.join(map(str,x))