Before_validation callback or callbacks?

I need to perform an amount normalization before validation, I can do it
with a callback
before_validation :normalize_totalAmount … fine
BUT I need to perform the same normalization on 3 amounts…
should I write 3 different before_validation callbacks
(:normalize_totalAmount, normalize_partPaymentAmount and
:normalize_depositAmount) with 3 methods

OR
can I write something like :

before_validation :normalize_Amount => totalAmount

and write a single method but in this case how can I pass the amount
value nd get it back the normalized one ??

def normalize_amount(n)

end

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