owner can manipulate fees in very wide range whiteout informing users.
This function must have an event that informs the user of the change of the fee, especially because in the current code there is no upper and lower limit and no limit at all for the owner in setting the fee.
owner can manipulate fee percentage as much as he/she wants. it is recommended to set at least an upper and a lower limit for it.
Add event to notify users for all these function
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