In C programming language, <string.h> is a header for void* and char* types, presumably spanning many consequtive characters.
/* Memory functions */ void *memccpy(void *, const void *, int, size_t); void *memchr(const void *, int, size_t); int memcmp(const void *, const void *, size_t); void *memcpy(void *, const void *, size_t); void *memmove(void *, const void *, size_t); void *memset(void *, int, size_t); /* String functions */ char *strcat(char *, const char *); char *strchr(const char *, int); int strcmp(const char *, const char *); int strcoll(const char *, const char *); char *strcpy(char *, const char *); size_t strcspn(const char *, const char *); char *strdup(const char *); char *strerror(int); size_t strlen(const char *); char *strncat(char *, const char *, size_t); int strncmp(const char *, const char *, size_t); char *strncpy(char *, const char *, size_t); char *strpbrk(const char *, const char *); char *strrchr(const char *, int); size_t strspn(const char *, const char *); char *strstr(const char *, const char *); char *strtok(char *, const char *); char *strtok_r(char *, const char *, char **); size_t strxfrm(char *, const char *, size_t);