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Warmup-1 > endUp
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Given a string, return a new string where the last 3 chars are now in upper case. If the string has less than 3 chars, uppercase whatever is there. Note that str.toUpperCase() returns the uppercase version of a string.


endUp("Hello") → "HeLLO"
endUp("hi there") → "hi thERE"
endUp("hi") → "HI"

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public String endUp(String str) { }

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