-extern int vprintf (const char *, va_list);
-extern int vfprintf (FILE * stream, const char *fmt, va_list ap);
-extern int vsprintf (char *, const char *, va_list);
+extern int vprintf (const char *fmt, va_list ap);
+extern int vfprintf (FILE *stream, const char *fmt, va_list ap);
+extern int vsprintf (char *str, const char *fmt, va_list ap);