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"""

Program to join a list of strings with a separator

"""

def join(separator: str, separated: list[str]) -> str:

"""

Joins a list of strings using a separator

and returns the result.

:param separator: Separator to be used

for joining the strings.

:param separated: List of strings to be joined.

:return: Joined string with the specified separator.

Examples:

>>> join("", ["a", "b", "c", "d"])

'abcd'

>>> join("#", ["a", "b", "c", "d"])

'a#b#c#d'

>>> join("#", "a")

'a'

>>> join(" ", ["You", "are", "amazing!"])

'You are amazing!'

This example should raise an

exception for non-string elements:

>>> join("#", ["a", "b", "c", 1])

Traceback (most recent call last):

...

Exception: join() accepts only strings

Additional test case with a different separator:

>>> join("-", ["apple", "banana", "cherry"])

'apple-banana-cherry'

"""

joined = ""

for word_or_phrase in separated:

if not isinstance(word_or_phrase, str):

raise Exception("join() accepts only strings")

joined += word_or_phrase + separator

# Remove the trailing separator

# by stripping it from the result

return joined.strip(separator)

if __name__ == "__main__":

from doctest import testmod

testmod()

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