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Fix strlen, implement strnlen and stdint.h, add strlen/strnlen tests #12
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strlenwas always off by one before this. I decided to change it to the efficient strlen implementation which checkssizeof(size_t)bytes at a time using bit twiddling, as it is kind of the standard nowadays for the non-assembly implementations.I also added stdint.h. It is not perfect, as it currently just does an educated guess about type sizes.