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from typing import List, Union
def clean_data(data: str) -> Union[str, List[str]]:
"""The clean_data function cleans the `data`.
Args:
data (str): the input data
Returns:
a list of strings if the data is not None or an empty string, an
empty string otherwise.
"""
if (not data) or (data == ""):
return ""
data_list = data.split("\n")
is_empty_list = all(map(lambda value: value == "", data_list))
if is_empty_list:
return ""
filtered_list = filter(None, data_list)
return list(map(lambda value: value.strip(), filtered_list))
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