Whoever abets an offence punishable with imprisonment shall, if that offence be not committed in consequence of the abetment, and no express provision is made by this Code for the punishment of such abetment, be punished with imprisonment of any description provided for that offence for a term which may extend to one-fourth part of the longest term provided for that offence;
or with such fine as is provided for that offence, or with both;

If abettor or person abetted be a public servant whose duty it is to prevent offence ? and if the abettor or the person abetted is a public servant, whose duty it is to prevent the commission of such offence, the abettor shall be punished with imprisonment of any description provided for that offence, for a term which may extend to one-half of the longest term provided for that offence, or with such fine as is provided for the offence, or with both.