Write a function encoding() that takes a string and an integer as the parameters, and returns an encoded string. The encoding is performed as follows. First, the given string is splited into two sub-strings, where characters at even poisitions is in one sub-string, characters at odd positions are in the second sub-string. The two sub-strings are then put together, even character string first. Then, each character c is replaced by the character c' that is located the given integer number of positions away from c in the ASCII character encoding table. For example:        encoding('ABCabc' ,-10)

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