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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...
X242: oneTwo
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.
Examples:
oneTwo("abc") -> "bca"
oneTwo("tca") -> "cat"
oneTwo("chocolate") -> "hocolctea"
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