Update research.h

src/research.h

@@ -1,9 +1,9 @@
 #ifndef RESEARCH_H
 #define RESEARCH_H
 
-bool research (void);		// detect clusters
+bool research(void);		// detect clusters
-int eliminate_c (void);		// eliminate clusters
+int eliminate_c(void);		// eliminate clusters
-int cascade();			// cascade ceiling tiles
+int cascade(void);		// cascade ceiling tiles
-int clear();			// clear matched array;
+int clear(void);		// clear matched array;
 
 #endif