Test cases are not passing

#1

My code is not working.
Code : https://ide.codingblocks.com/s/656703
Can you please share your code

#2

@singhsaurabhlps7_18d9f31919917399,
your code fails for “aaaaaaaaaa” ans should be “a”

check here : https://ide.codingblocks.com/s/656852

#3

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