Wrong Output for some test cases

#1

Can anyone please check my code? Getting wrong output for some of my test cases.

#2

Hey @Divye-Aggarwal-3050062625037589 try for this test case
aaaabbccccaaaabcbacba
Expected output is abcabcbacba
Try to debug it. If fails to do it. Let me know will help accordingly.

#3

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