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String-2 > oneTwo
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Given a string, compute a new string by moving the first char to come after the next two chars, so "abc" yields "bca". Repeat this process for each subsequent group of 3 chars, so "abcdef" yields "bcaefd". Ignore any group of fewer than 3 chars at the end.

oneTwo("abc") → "bca"
oneTwo("tca") → "cat"
oneTwo("tcagdo") → "catdog"

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

public String oneTwo(String str) { }

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