# Functions
BytesToHex encodes b as a hex string with 0x prefix.
Has0xPrefix returns true if input start with 0x, otherwise false.
HexToBytes decodes a hex string with 0x prefix.
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# Variables
ErrEmptyString empty hex string.
ErrInvalidOddLength hex string of odd length.
ErrMissingPrefix hex string without 0x prefix.
ErrSyntax invalid hex string.