text: #ifndef STREAM_H
  #define STREAM_H
  
  #include <sys/types.h>
  
  typedef struct t_row t_row;
  
  void insert_row(int at, const char *const s, size_t len);
  
  void rm_char(void);
  
  void update_row(t_row* row);
  
  void insert_char_at_row(t_row* row, int at, int c);
  
  void insert_char(int c);
  
  void insert_nl(void);
  
  #endif
  