juste better

app/src/main/java/chess/io/OutputSystem.java

@@ -1,8 +1,20 @@
 package chess.io;
 
-public abstract class OutputSystem implements OutputSystemInterface {
+import chess.model.Color;
 
-	public OutputSystem() {
-	}
+public interface OutputSystem {
 
+	void playerTurn(Color color);
+
+	void winnerIs(Color color);
+
+	void kingIsInCheck();
+
+	void kingIsInMat();
+
+	void patSituation();
+
+	void hasSurrendered(Color color);
+
+	void gameStarted();
 }