code: func checkIfTaintsAlreadyExists(oldTaints []corev1.Taint, taints []corev1.Taint) string {
  	var existingTaintList = make([]string, 0)
  	for _, taint := range taints {
  		for _, oldTaint := range oldTaints {
  			if taint.Key == oldTaint.Key && taint.Effect == oldTaint.Effect {
  				existingTaintList = append(existingTaintList, taint.Key)
  			}
  		}
  	}
  	return strings.Join(existingTaintList, ",")
  }
docs: // CheckIfTaintsAlreadyExists checks if the node already has taints that we want to add and returns a string with taint keys.