Why I have ony done one task? 2048 (Part 10/18)

Why I have ony done one task? What's wrong with moving left? TASK: 2048 (Part 10/18) • The moveLeft() method must move to the left and merge the elements of the gameField matrix in accordance with the rules of the game. • The moveLeft() method must call the compressRow(int[]) method at least once for each row of the gameField matrix. • The moveLeft() method must call the mergeRow(int[]) method at least once for each row of the gameField matrix. • The moveLeft() method must add a tile using the createNewNumber() method if a move or merger has occurred. • The moveLeft() method must not change the contents of the gameField matrix if neither a move nor a merger is possible. Why this first task isn't done? What is wrong with moving?

package com.codegym.games.game2048;
import com.codegym.engine.cell.*;



public class Game2048 extends Game{

    public void onKeyPress(Key key){
        if(key == Key.UP) {
            moveUp();
        }else if(key == Key.DOWN){
            moveDown();
        }else if(key == Key.RIGHT){
            moveRight();
        }else if(key == Key.LEFT){
            moveLeft();
        }
    }

    private static final int SIDE = 4;
    private int [][] gameField = new int[SIDE][SIDE];


    private void createGame(){
        createNewNumber();
        createNewNumber();
    }

    private void drawScene(){
        for(int i = 0; i<SIDE; i++){
            for(int j = 0; j<SIDE; j++){
                setCellColoredNumber(i, j, gameField[j][i]);
            }
        }
    }
    private void createNewNumber() {
        int x = getRandomNumber(SIDE);
        int y = getRandomNumber(SIDE);

        int value;

        if (getRandomNumber(10) == 9){
            value = 4;
        } else {
            value = 2;
        }

        if (gameField[x][y] == 2 || gameField[x][y] == 4){
            createNewNumber();
        } else {
            gameField[x][y] = value;
        }
    }

    private Color getColorByValue(int value){
        //return a cell color based on value
        switch(value){
            case 0: return Color.WHITE;
            case 2: return Color.BLUE;
            case 4: return Color.RED;
            case 8: return Color.GREEN;
            case 16: return Color.CYAN;
            case 32: return Color.GRAY;
            case 64: return Color.MAGENTA;
            case 128: return Color.ORANGE;
            case 256: return Color.PINK;
            case 512: return Color.YELLOW;
            case 1024: return Color.PURPLE;
            case 2048: return Color.BROWN;
            default: return Color.WHITE;
        }
    }

    private void setCellColoredNumber(int x, int y, int value){
        if(value!=0){
            setCellValueEx(x,y,getColorByValue(value),Integer.toString(value));
        }
        else{
            setCellValueEx(x,y,getColorByValue(value),"");
        }
    }

    private boolean compressRow(int[] row){
        int clonevalue=0;
        boolean boolvalue = false;

        for(int i = 1; i<row.length; i++) {
            for (int j = 1; j < row.length; j++) {
                if (row[j - 1] == 0 && row[j] != 0) {
                    clonevalue = row[j - 1];
                    row[j - 1] = row[j];
                    row[j] = clonevalue;
                    boolvalue = true;
                }
            }
        }
        return boolvalue;
    }

    private boolean mergeRow(int[] row){
        boolean boolvaluemerge = false;

        for(int i = 1; i<row.length; i++) {
            if(row[i]!=0 && (row[i-1] == row[i])){
                row[i-1] = row[i-1] * 2;
                row[i] = 0;
                boolvaluemerge = true;
            }
        }
        return boolvaluemerge;
    }

    private void moveLeft(){
        int[] copyField = new int[SIDE];
        int clonevalue = 0 ;


        //MOVE LEFT

       for(int i = 0; i<SIDE; i++) {
            for(int k = 1; k<SIDE; k++) {
                for (int j = 1; j < SIDE; j++) {
                    if (gameField[i][j - 1] == 0 && gameField[i][j] != 0) {
                        clonevalue = gameField[i][j - 1];
                        gameField[i][j - 1] = gameField[i][j];
                        gameField[i][j] = clonevalue;
                    }
                }
            }
        }


        //MOVE LEFT


    }
    private void moveRight(){

    }
    private void moveUp(){

    }
    private void moveDown(){


    }

    public void initialize() {
        setScreenSize(SIDE, SIDE);
        createGame();
        drawScene();
    }
}