hasFileSuffix("bla.txt", "txt") # TRUE
hasFileSuffix("bla.txt", ".txt") # TRUE
hasFileSuffix("bla.txt", ".TXT") # TRUE
hasFileSuffix("foo", "") # TRUE
hasFileSuffix("", "") # TRUE
hasFileSuffix("bla.txt", "doc") # FALSE
hasFileSuffix("bla.txt", ".doc") # FALSE
hasFileSuffix("fo", ".doc") # FALSE
hasFileSuffix("", ".doc") # FALSE
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