char *strdup(const char *src)

size_t free_str_array(char **arr)

char *str_join(char **parts, size_t n, char sep)

void *arena_alloc(size_t n)

void *heap_alloc(size_t n)

void *calloc(size_t nmemb, size_t size)

char **split(char *str, char *charset)

void *mem_resize(void *ptr, size_t old_size, size_t new_size)