#ifndef LIBSPELL_H
#define LIBSPELL_H
char *spell(sqlite3*, char *);
char *get_suggestions(char *);

#endif

#ifndef LIBSPELL_H
#define LIBSPELL_H
char *spell(char *);
char *get_suggestions(char *);

#endif

Remove sqlite3 * parameter from the spell function's declaration.
Remove sqlite3 * parameter from the spell function's declaration.
