Can you walk me through the entire story of Cholkar's vow to Sai Baba and the miracle that followed?

The story of Cholkar, found in Chapter 15, illustrates Baba's omniscience. Cholkar, a poor man whose job depended on passing an exam, vowed that if he passed by Baba's grace, he would visit Shirdi and distribute sugar candy. After his wish was granted, he struggled financially, which delayed his pilgrimage. During this waiting period, he made a personal sacrifice by giving up sugar entirely, even drinking his tea unsweetened. When he finally reached Shirdi and fulfilled his vow, Baba revealed his knowledge of this secret. As Cholkar was leaving with his host, Mr. Jog, Baba specifically told Jog to give Cholkar "cups of tea, well-filled with sugar." This stunned Cholkar, confirming that Baba knew about both the public vow and the private sacrifice, filling him with joy and devotion.