text: # Copyright (C) 2020 Cancer Care Associates
  
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  
  #     http://www.apache.org/licenses/LICENSE-2.0
  
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  
  def filter_patient_names(patient_names):
      patient_names = list(set(patient_names))
  
      if len(patient_names) == 1:
          patient_name = patient_names[0]
      elif len(patient_names) == 0:
          patient_name = ""
      else:
          patient_name = f"Multiple Names Found: f{', '.join(patient_names)}"
  
      return patient_name
  