add_ending(["clever", "meek", "hurried", "nice"], "ly") ➞ ["cleverly", "meekly", "hurriedly", "nicely"]

add_ending(["new", "pander", "scoop"], "er") ➞ ["newer", "panderer", "scooper"]

add_ending(["bend", "sharpen", "mean"], "ing") ➞ ["bending", "sharpening", "meaning"]

self.assertEqual(add_ending(["clever", "meek", "hurried", "nice"], "ly"), ["cleverly", "meekly", "hurriedly", "nicely"])
self.assertEqual(add_ending(["new", "pander", "scoop"], "er"), ["newer", "panderer", "scooper"])
self.assertEqual(add_ending(["bend", "sharpen", "mean"], "ing"), ["bending", "sharpening", "meaning"])

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