Improve performance of multipart boundary searching#6
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The current approach of looking for the first character in the boundary with
indexOfis really slow and naive. Instead, we can use a skip table while searching for the first character. To keep the code relatively the same, we don't perfom a first search and basically only giveindexOfthe knowledge of the full boundary. It'll use the first and last character, and a skip table to optimise its performance and skip over parts of the boundary.