Problems with colliding sprites

Phaser 3
1

I am trying to make it so that when my star collides with the cow (both are sprites) that the score is reduced by 40 only once, the camera shakes, and the star is repositioned to the center of the screen. I’m not sure how to go about achieving this. I would appreciate some guidance:)

<!doctype html> 
<html lang="en"> 
<head> 
<meta charset="UTF-8" />
<title> Wishing Star </title>
<script src="//cdn.jsdelivr.net/npm/phaser@3.11.0/dist/phaser.js"></script>
<style type="text/css">
    body {
        margin: 0;
    }
</style>
</head>
<body>

<script type="text/javascript">

var config = {
type: Phaser.AUTO,
width: 1300,         //dimensions
height: 600,
physics: {
    default: 'arcade',
    arcade: {
        gravity: { y: 300 },
        debug: false
    }
},
scene: {
    preload: preload,
    create: create,
    update: update,
}
};

var player;
var particles_;
var emitter_;
var cow_enemy_;
var dust;
var dust_spawn_area;
var score = 0;
var scoreText;
var cursors;

var game = new Phaser.Game(config);

function preload ()
{
//background
this.load.image('bg', 'assets/background.png');
//sprites
this.load.image('star', 'assets/sprites/peonay.png');
this.load.image('stardust', 'assets/sprites/starDust.png');
this.load.image('cow','assets/sprites/enemies/cow/chew2.png');
//particles
this.load.image('red','assets/particles/red.png');

}

function create ()
{
//camera and world bounds
this.cameras.main.setBounds(0, 0, 1000  , 1200 );
this.physics.world.setBounds(220, 0, 850 , 1200);

//adding the background
this.add.image(250, 0, 'bg').setOrigin(0);

particles_ = this.add.particles('red');

//  Create an emitter by passing in a config object directly to the Particle Manager
emitter_ = particles_.createEmitter({
speed: 100,
scale: { start: 0.5, end: 0 },
//blendMode: 'ADD'
});

//adding the star as a sprite
//x, y, key for spawn
player = this.physics.add.sprite(650, 200, 'star');

player.setCollideWorldBounds(true);

player.setBounce(0.2);

//enabling keyboard input
cursors = this.input.keyboard.createCursorKeys();

//This is how we get the camera to follow the player
this.cameras.main.startFollow(player, true, 0.05, 0.05);

//Get the particles to follow the player
emitter_.startFollow(player);


//  Create 10 sprites (they all start life at 0x0)
//  added as a physics group to allow for overlap
dust = this.physics.add.group(
   {
        key: 'stardust', 
        frameQuantity: 10,
        immovable: true,
        allowGravity: false 
    }
);

dust_spawn_area = new Phaser.Geom.Rectangle(250, 0, 750, 1200);

//  Randomly position the sprites within the rectangle
Phaser.Actions.RandomRectangle(dust.getChildren(), dust_spawn_area);

//cow_enemy_ = this.physics.add.sprite(Phaser.Math.Between(220, 850),Phaser.Math.Between(0, 1200),'cow_enemy');
  cow_enemy_ = this.physics.add.group( 
            {
                key: 'cow',
                immovable: true,
                allowGravity: false 
                }
      ); 
Phaser.Actions.RandomRectangle(cow_enemy_.getChildren(), dust_spawn_area);

//  The score
scoreText = this.add.text(16, 16, 'score: 0', { fontSize: '32px', fill: '#ffc0cb' });

// If the player hits the dust, we call collectDust
this.physics.add.overlap(player, dust, collectDust, null, this);

//If the player hits a cow, we shake the camera, lose some dust, try for emit
this.physics.add.collider(player, cow_enemy_, shake, null, this);




}

function update ()
{
player.setVelocity(0);

if (cursors.left.isDown)
{
    player.setVelocityX(-500);
}
else if (cursors.right.isDown)
{
    player.setVelocityX(500);
}

if (cursors.up.isDown)
{
    player.setVelocityY(-500);
}
else if (cursors.down.isDown)
{
    player.setVelocityY(500);
}
}

function collectDust(player, dust){

dust.disableBody(true, true);

//  Add and update the score
score += 10;
scoreText.setText('Score: ' + score);
 
}

function shake(){

Phaser.Actions.ShiftPosition(player, 400, 300);
this.cameras.main.shake(500);

score-=40;

}




/*
//activating world gravity in the y direction with the initial rate
//game.physics.world.gravity.y = 60;
//player.setGravity(0,1000);
//player.body.setGravityY(12500);
// player.body.setAllowGravity(true);
//accelerateTo(player, 650 , 600 , 50, 200, 500);

*/

</script>

</body>
</html>