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String-1 > left2
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Given a string, return a "rotated left 2" version where the first 2 chars are moved to the end. The string length will be at least 2.

left2("Hello") → "lloHe"
left2("java") → "vaja"
left2("Hi") → "Hi"

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

public String left2(String str) { }

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