new_contents: '''
  In this module we remove duplicates in a string
  
  '''
  
  
  def remove_duplicates(string):
  	'''
  	Remove duplicated characters in string
  
  	'''
      result = []
      seen = set()
      for char in string:
          if char not in seen:
              seen.add(char)
              result.append(char)
      return ''.join(result)
subject: Add function to remove duplicates from a string