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Given an out string of length 4, such as "<<>>", and a word, return a new string where the word is in the middle of the out...
Given an out string of length 4, such as "<<>>", and a word, return a new string where the word is in the middle of the out string, e.g. "<>". Note: use str.substring(i, j) to extract the String starting at index i and going up to but not including index j.
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