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Total changes in 4 files
1). Collection -->src-->com--> cdac--> collections -->collectionsutils-->CollectionDemo.java (made Renaming of variable elt and refactored the code with extract Method).
2). Collection -->src-->com--> cdac--> collections --> threadsafe --> MainProgram,java, EmployeeRunnable.java, and StudentRunnable.java (Move method).
3).EncryptionDecryption --> src --> com --> cdac --> encrypt --> aes --> AESEncryption.java(extract class refactoring is performed).
4). CountVowels.java in which extract class and Replace conditional with polymorphism is processed and compiled successfully.