(a) A voter who receives an absentee voter's ballot may, on any day prior to the day of the election, appear at the office of the City Clerk, and execute his ballot in the following manner:
(1) The voter will first display the ballot to the Clerk to show that the ballot has not been previously marked. He then will proceed to mark the ballot in the voting booth at the Clerk's office. The voter will place the ballot in the envelope provided to him in a manner that permits the Clerk to see the number of the ballot. The voter will then hand the envelope to the Clerk, who will examine it. If the Clerk determines that the ballot is numbered correctly, he will tear the printed number off and permit the voter to enclose the ballot in the identification envelope.
(2) The voter will then make out and swear to the affidavit printed on the face of the envelope. He will seal the envelope and deliver it to the Clerk.
(3) The Clerk will certify the affidavit printed on the identification envelope by writing or stamping his name across the seal. The Clerk will deposit the envelope in a safe place in his office, to be kept by him and delivered to the canvassing committee.
(b) If an absentee voter returns to the city on election day, he will not be allowed to vote unless he surrenders the absentee voter's ballot and any other supplies mailed to him.