Question: Given a string, return a new string made of 3 copies of the last 2 chars of the original string. The string length will be

Given a string, return a new string made of 3 copies of the last 2 chars of the original string. The string length will be at least 2.
extra_end('Hello')-> 'lololo'
extra_end('ab')-> 'ababab'
extra_end('Hi')-> 'HiHiHi'

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