fix warnings

app/src/main/java/chess/view/DDDrender/DDDView.java

@@ -4,7 +4,6 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.function.Consumer;
-import java.util.function.Function;
 
 import chess.controller.commands.*;
 import imgui.ImGui;
@@ -23,7 +22,6 @@ import chess.model.Piece;
 import chess.view.DDDrender.world.BoardEntity;
 import chess.view.DDDrender.world.PieceEntity;
 import chess.view.DDDrender.world.World;
-import common.Signal0;
 
 public class DDDView extends GameAdapter implements CommandSender {
 
@@ -282,12 +280,6 @@ public class DDDView extends GameAdapter implements CommandSender {
         return begin.mul((1.0f - t) * (1.0f - t)).add(middle.mul(2.0f * t * (1.0f - t))).add(end.mul(t * t));
     }
 
-    private Function<Float, Float> lagrangeInterpolation(Vector3f begin, Vector3f middle, Vector3f end) {
-        return (t) -> {
-            return t + 1.0f;
-        };
-    }
-
     private void pieceTick(float progress, PieceEntity piece, Move move) {
         float height = 1; // how much the piece is raised
         Vector2f pieceStartBoard = DDDPlacement.coordinatesToVector(move.getStart());