likedOrNot = async (user, post) => {
  let s = await db.query(
    'SELECT COUNT(like_id) AS l FROM likes WHERE like_by=? AND post_id=?',
    [user, post]
  )
  return db.tf(s[0].l)
}
Returns whther user liked the post
@param {Number} user User ID
@param {Number} post Post ID
@returns {Boolean} Boolean