If a prisoner is pardoned conditionally or unconditionally, or his punishment is commuted, the officer to whom the warrant for such purpose is issued shall, as soon as may be after executing it, make return thereof, signed by him, with his doing thereon, to the Governor’s office, and shall file in the office of the clerk of the court in which the offender was convicted an attested copy of the warrant and return, and the clerk shall file the same in his office and subjoin a brief abstract thereof to the record of the conviction and sentence, and at the next regular term of said court said warrant shall be entered upon the minutes of the court. (1905, c. 356, s. 4; Rev., s. 5337; C.S., s. 7645.)