-#ifndef SLIDING_WINDOW_H_
-#define SLIDING_WINDOW_H_
+#ifndef SLIDING_WINDOW_H
+#define SLIDING_WINDOW_H
#include "strbuf.h"
#define SLIDING_VIEW_INIT(input, len) { (input), 0, 0, (len), STRBUF_INIT }
-extern int move_window(struct sliding_view *view, off_t off, size_t width);
+int move_window(struct sliding_view *view, off_t off, size_t width);
#endif