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These two new functions will make it easier to manipulate small strings from within functions, because at many places, multiple short strings are needed which do not deserve a malloc() nor a free(), and alloca() is often discouraged. Since we already have trash chunks, it's convenient to be able to allocate substrings from a chunk and use them later since our functions already perform all the length checks. chunk_newstr() adds a trailing zero at the end of a chunk and returns the pointer to the next character, which can be used as an independant string. chunk_strcat() does what it says.