I can only comment on question #3. It appears that scanner_buffer is 1024 bytes long, but only the bytes up to scanner_buffer_position have been set. Therefore the copy operation copies the relevant portion of scanner_buffer to a new array, encodedBytes, that is just the right length. If she had passed all of scanner_buffer to String(...), she would have gotten a string that represented all of scanner_buffer, including the entries that had not yet been set.
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