removed repititve function definitions

[EraKin575]

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Closes: #1033

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[EraKin575]

@Sarthak160 please review this PR

[Sarthak160]

And also Remove func CreateShingles(data []byte, k int) from postgres utils as it's used nowhere .

[Sarthak160]

LGTM

[Sarthak160]

@EraKin575 func PostgresDecoder and func PostgresEncoder are also used for generic payload , you can rename them to func GenericDecoder and move them to util/utils.go as well .