```c
#ifndef UTILS_H
# define UTILS_H

# include <stdint.h>
# include <stdio.h>

char *
read_line(FILE *f);

int8_t
starts_with(const char *str, const char *prefix);

char *
extract_fence_ext(const char *fence);

const char *
extract_file_ext(const char *path);

const char *
infer_ext_from_filename(const char *path);

#endif
```