Hi I have a problem with the codility exercises on the square, I am trying to do something 2 days and nothing anyone has a solutions

Build a like button component using Angular (v4). Export the like button component as "LikeButtonComponent" (export class LikeButtonComponent).

Requirements:

There should be a like button: The content of the like button should be in the following format: "Like | 100", where 100 is the total number of likes. It should have a "like-button" class. Wrap the number of likes in a span with a "likes-counter" class. The initial number of likes in the counter should be 100.

Users can add a like. By clicking the button: The number of likes should increase by one. Like button should have "liked" class in addition to the "like-button" class.

Users can undo their like by clicking again on the button: The counter should decrease by one. "liked" class should be removed.

And code

import { Component, Injectable } from '@angular/core';

@Component({
    selector: 'like-button',
    template: `
        <h2>
          <span
  ><button (click)="buttonCliked()">Like |{{ likebutton.likeCounter }}</button></span
>
        </h2>
    `,
    styles: [`
        .like-button {
            font-size: 1rem;
            padding: 5px 10px;
            color:  #585858;
        }

        .liked {
            font-weight: bold;
            color: #1565c0;
        }
    `]
})

export class LikeButtonComponent {

  public likeCounter = 100;

  constructor(private likeButton: LikeButton, private liked: Liked) {}

  buttonCliked(): void {
    this.changeLikeNumber();
    this.toggleLike();
  }

  private toggleLike(): void {
    this.liked.isLiked = !this.liked.isLiked;
  }

  private changeLikeNumber(): void {
    if (!this.liked.isLiked) {
      this.likeCounter = this.likeButton.increment(this.likeCounter);
    } else {
      this.likeCounter = this.likeButton.decrement(this.likeCounter);
    }
  }
}

export class LikeButton {
  constructor(private liked: Liked) {}
  increment(likeCounter: number) {
    likeCounter++;

    return likeCounter;
  }
  decrement(likeCounter: number) {
    likeCounter--;
    return likeCounter;
  }
}

export class Liked {
  isLiked = false;
}