def clean_column(string):
    """
    Description :
        This function allow you to transform a string separated by comas in a list of string :

            Transforming the string in a list
            Removing the duplicated 
            Removing empty space
    Args:
        string: string 

    Returns:
        output: list of string
    """
    list_of_strng = list(set(string.split(",")))
    list_of_strng = list(filter(None,list_of_strng))

    return list_of_strng