code: func mgetCommand(c *client) error {
  	args := c.args
  	if len(args) == 0 {
  		return ErrCmdParams
  	}
  
  	if v, err := c.db.MGet(args...); err != nil {
  		return err
  	} else {
  		c.resp.writeSliceArray(v)
  	}
  
  	return nil
  }
docs: // func setexCommand(c *client) error {
  // 	return nil
  // }