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

The story of Cholkar highlights Sai Baba's omniscience and compassion. As told in Chapter 15, Cholkar was a poor man who needed to pass an examination to secure his job. He made a vow to Baba that if he passed, he would come to Shirdi and distribute sugar candy. After successfully passing, financial hardship, referred to as the 'threshold-ghat' of home expenses, delayed his journey. During this waiting period, Cholkar gave up sugar entirely as a personal sacrifice, even drinking his tea without it. When he eventually gathered the funds to travel to Shirdi, he fulfilled his vow by distributing sugar. The climax of the story is when Baba, who did not drink tea, instructed someone to give Cholkar tea that was 'well-filled with sugar,' demonstrating that He was aware of Cholkar's secret penance all along.