Can you tell me the full story of Cholkar and his vow about sugar?

The story of Cholkar, detailed in Chapter 15, revolves around a vow he made to Sai Baba. As a man from a poor household, Cholkar needed to pass an examination to secure his job. He vowed that if he passed by Baba's grace, he would visit Shirdi and distribute sugar candy (khadisakhar). After his wish was granted, he was unable to immediately fulfill the vow due to financial difficulties, described as the difficult "threshold-ghat" of home expenses. As a personal penance for the delay, Cholkar gave up sugar entirely, even drinking his tea without it. When he finally managed to reach Shirdi, he fulfilled his vow. The climax occurred when Baba, knowing Cholkar's secret sacrifice, specifically told his host, Jog, to serve Cholkar "cups of tea, well-filled with sugar," confirming to the devotee that his vow and penance were known and accepted.