#include <string.h>
<string.h> provides declarations for the string and memory manipulation routines:
void * memchr(const void *s, int c, size_t n); int memcmp(const void *s1, const void *s2, size_t n); void * memcpy(void *s1, const void *s2, size_t n); void * memmove(void *s1, const void *s2, size_t n); void * memset(void *s, int c, size_t n); char * strcat(char *s1, const char *s2); char * strchr(const char *s, int c); int strcmp(const char *s1, const char *s2); char * strcpy(char *s1, const char *s2); size_t strcspn(const char *s1, const char *s2); char * strerror(int errnum); size_t strlen(const char *s); char * strncat(char *s1, const char *s2, size_t n); int strncmp(const char *s1, const char *s2, size_t n); char * strncpy(char *s1, const char *s2, size_t n); char * strpbrk(const char *s1, const char *s2); char * strrchr(const char *s, int c); size_t strspn(const char *s1, const char *s2); char * strstr(const char *s1, const char *s2); char * strtok(char *s1, const char *s2);
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