CodingBat isUnique

isUnique

We call the given string unique, if the first, middle, and the last characters are the same. We also call the given string unique when the middle character and 2 characters around it are the same. Return true if the given string is unique, and false otherwise.

isUnique("cat") → false
isUnique("AAA") → true
isUnique("a") → false

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