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Warmup-1 > backAround
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Given a string, take the last char and return a new string with the last char added at the front and back, so "cat" yields "tcatt". The original string will be length 1 or more.

backAround("cat") → "tcatt"
backAround("Hello") → "oHelloo"
backAround("a") → "aaa"

...Save, Compile, Run (ctrl-enter)

public String backAround(String str) { }

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