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Warmup-1 > notString
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Given a string, return a new string where "not " has been added to the front. However, if the string already begins with "not", return the string unchanged. Note: use .equals() to compare 2 strings.


notString("candy") → "not candy"
notString("x") → "not x"
notString("not bad") → "not bad"

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public String notString(String str) { }

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