#pragma once #include long strtol(const char *restrict s, char **restrict end, int base); char *strchr(const char *s, int c); size_t strspn(const char *s, const char *accept); size_t strcspn(const char *s, const char *reject); char *strtok(char *restrict s, const char *restrict sep); char *strtok_r(char *restrict s, const char *restrict sep, char **restrict state); int strncmp(const char *s1, const char *s2, size_t n);