replace("abcdef", "c-e") ➞ "ab###f"

replace("rattle", "r-z") ➞ "#a##le"

replace("microscopic", "i-i") ➞ "m#croscop#c"

self.assertEqual(replace("abcdef", "c-e"), "ab###f")
self.assertEqual(replace("rattle", "r-z"), "#a##le")
self.assertEqual(replace("microscopic", "i-i"), "m#croscop#c")
self.assertEqual(replace("", "a-z"), "")
self.assertEqual(replace("bountiful", "a-o"), "##u#t##u#")
self.assertEqual(replace("zebra", "a-z"), "#####")

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