Save File
You are given a sequence of names of existing files and a single filename that need to be saved into the sequence.
If a file with the same name already exists in the sequence, a numerical suffix (n) should be added to the file name (the first integer n, with which a new filename is not present in the sequence). Note, that filename may already include one or more suffixes.
The function should return the name with which the file will be saved into the sequence.
Input: Tuple of strings (str) and a string.
Output: String.
Examples:
assert save_file((), "name.txt") == "name.txt"
assert save_file(("test.txt",), "name.txt") == "name.txt"
assert save_file(("name.txt",), "name.txt") == "name(1).txt"
assert (
save_file(("name(56).txt", "name(56)(1).txt", "name(56)(2).txt"), "name(56).txt")
== "name(56)(3).txt"
)
