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String-1 > twoChar
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Given a string and an index, return a string length 2 starting at the given index. If the index is too big or too small to define a string length 2, use the first 2 chars. The string length will be at least 2.

twoChar("java", 0) → "ja"
twoChar("java", 2) → "va"
twoChar("java", 3) → "ja"

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public String twoChar(String str, int index) { }

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