old_contents: NEWPOST = """---
  title: {{ title }}
  date: {{ date }}
  tags: [{{ slug }}]
  ---
  
  Writting text here!
  """
  
new_contents: NEWPOST = """---
  title: {{ title }}
  date: {{ date }}
  tags: [{{ tags }}]
  slug: {{ slug }}
  ---
  
  Writting text here!
  """
  
subject: fix typo NEWPOST template