 import UIKit
 
 class ViewController: UIViewController, UICollectionViewDataSource {
-  private let ColorCellIdentifier = "ColorCell"
+  private let colorCellIdentifier = "ColorCell"
 
   @IBOutlet weak var colorCollectionView: UICollectionView!
 

  }

  func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: ColorCellIdentifier, for: indexPath) as! ColorCellView

    let (title, color) = collection(inSection: indexPath.section)[indexPath.row]


  }

  func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
    // swiftlint:disable force_cast
    let supplementaryView = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "HeaderView", for: indexPath) as! HeaderView
    supplementaryView.titleLabel.text = indexPath.section == 0 ? "Colors" : "Gradients"
    
