add getIndex and setCol and the header of forza4

inc/forza4.h

@@ -0,0 +1,12 @@
+#ifndef FORZA4_H
+#define FORZA4_H
+
+#include <structures.h>
+
+static int col;
+
+void setCollums(int collums);
+int getIndex(int i, int j);
+int checkWin(tile_t *board, int x, int y, int rows, int collums);
+
+#endif

src/forza4.c

@@ -1,12 +1,20 @@
 #include <stdio.h>
 
-#include <structures.h>
+static int col;
+
+void setCollums(int collums) {
+	col = collums;
+}
+
+int getIndex(int i, int j) {
+	return i * col + j;
+}
 
 // checks board for a win
 // returns player number on win, otherwise 0
 // x e y come cartesiani, rows e collums le dimensioni
 int checkWin(tile_t *board, int x, int y, int rows, int collums) {
-    int i;
+	int i;
 	tile_t current = board[x + y * collums];
 
 	// horrizontal