for x in df['seller']:
  counter = 0
  for y in automobile:
    if y in x:
      counter += 1
      for z in automobile:
        if z in x:
          counter += 1
        else:
          counter += 0
    else:
      counter += 0
    if counter == 1:
      df[x] = y
    else:
      df[x] = x