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

The story of Cholkar, as detailed in Chapter 15, is a poignant example of faith and divine omniscience. Cholkar, a man from a poor household, vowed to Sai Baba that if he passed a crucial job examination, he would visit Shirdi and distribute sugar candy. After passing the exam through Baba's grace, he faced financial difficulties, described as the difficult 'threshold-ghat' of home expenses, which delayed his pilgrimage. As a personal penance during this delay, he gave up eating sugar entirely. When he finally reached Shirdi and fulfilled his vow, Baba confirmed his knowledge of this secret sacrifice by instructing a host to give Cholkar tea 'well-filled with sugar', thereby solidifying Cholkar's faith.