Can you recount the story of Cholkar's vow to Sai Baba and how it was fulfilled?

The story of Cholkar illustrates Sai Baba's omniscience and grace. As detailed in Chapter 15, Cholkar was a poor man whose livelihood depended on passing an examination. He made a vow to Sai Baba that if he passed, he would come to Shirdi and distribute sugar candy (khadisakhar) in Baba's name. His wish was granted, and he passed the exam. However, due to financial difficulties, described as the difficult "threshold-ghat" of household expenses, he could not immediately travel to Shirdi. As a personal penance for the delay, Cholkar gave up sugar entirely, even drinking his tea without it. When he finally managed to visit Shirdi, he fulfilled his vow. In a beautiful confirmation of his omniscience, Baba later instructed Mr. Jog to give Cholkar tea that was "well-filled with sugar," revealing that He was aware of Cholkar's secret sacrifice all along. This act brought tears of joy to Cholkar's eyes, solidifying his faith.