Write checkVertical function

src/main/c/VierGewinnt.c

@@ -166,3 +166,18 @@ int checkHorizontal(char board[ROWS][COLS], char player) {
     }
     return 0;
 }
+
+//Write checkVertical function
+int checkVertical(char board[ROWS][COLS], char player) {
+    for (int col = 0; col < COLS; col++) {
+        for (int row = 0; row <= ROWS - 4; row++) {
+            if (board[row][col] == player &&
+                board[row + 1][col] == player &&
+                board[row + 2][col] == player &&
+                board[row + 3][col] == player) {
+                return 1;  // Gewonnen
+            }
+        }
+    }
+    return 0;
+}