#ifndef _STRING_H #define _STRING_H #include extern void *memcpy(void *dest, const void *src, size_t n); extern void *memset(void *s, unsigned char c, size_t n); extern void *memmove(void *dest, const void *src, size_t n); extern int8_t memcmp(const void *s1, const void *s2, size_t n); extern char *strcpy(char *dest, const char *src); extern char *strncpy(char *dest, const char *src, size_t n); extern size_t strlen(const char *s); extern int8_t strcmp(const char *s1, const char *s2); extern int8_t strncmp(const char *s1, const char *s2, size_t n); #endif