What specific vow did Cholkar make to Sai Baba, and what personal sacrifice did he undertake while waiting to fulfill it?

According to Chapter 15, Cholkar, a man from a poor household, was concerned about passing an examination to make his job salary permanent. He made a vow to Sai Baba that if he passed by His grace, he would distribute sugar candy (khadisakhar) in Baba's name. After his wish was granted, he faced a delay in fulfilling the vow due to financial difficulties, as he felt he could not go to Shirdi empty-handed. During this period of delay, Cholkar made a significant personal sacrifice by giving up sugar entirely. The text explicitly mentions that he avoided sugar as an inedible substance and even drank his tea without it until he could finally make the journey to Shirdi to fulfill his promise.