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extern char *strsep(char **, const char *);
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extern size_t strspn(const char *__s, const char *__accept) __ATTR_PURE__;
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extern char *strstr(const char *, const char *) __ATTR_PURE__;
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extern char *strtok_r(char *, const char *, char **);
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extern char *strupr(char *);