code: def fix_var_name(var_name):
      
      name = var_name.strip()
      for char in '(). /#,':
          name = name.replace(char, '_')
      name = name.replace('+', 'pos_')
      name = name.replace('-', 'neg_')
      if name.endswith('_'):
          name = name[:-1]
      return name
docs: Clean up and apply standard formatting to variable names.