What exactly was the vow that Cholkar made to Sai Baba, and what personal sacrifice did he undertake when he couldn't fulfill it immediately?

Cholkar, who came from a poor household, was facing an important examination that his job depended on. As recounted in Chapter 15, he made a vow to Sai Baba that if he passed the exam by Baba's grace, he would visit Shirdi and 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 could not afford the journey. During this waiting period, Cholkar demonstrated his firm resolve by making a personal sacrifice: he completely gave up sugar, even going so far as to drink his tea without it, treating sugar as an inedible substance until he could finally make his pilgrimage to Shirdi.