text: /* utils.h */
  
  #ifndef _UTILS_H
  #define _UTILS_H
  
  /* allocate space for new string, initialize all chars to '\0' */
  char *string_init(int sz);
  
  /* return new string stripped of leading and trailing spaces */
  /*   (including \n and \t) */
  char *trim(char *s);
  
  #endif /* _UTILS_H */
  