这篇博客涵盖了四个算法题目，包括如何反转链表、检测链表中是否存在环、反转环形链表以及反转句子中每个单词的字母。同时，它也讨论了针对前两个和第四个算法的设计测试用例。
Algorithms:
1. Implement an algorithm to reverse a linked list.
2. Implement an algorithm to detect the existence of a circle in a linked list.
3. Implement an algorithm to reverse a circular linked list.
4. Implement an algorithm to reverse letters in each word of a sentence. E.g. “This is a test” -> “sihT si a tset”
Testing:
1. Design test cases for algorithm 1 & 3
2. Design test cases for algorithm 4
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