Tell mistake in the smart keypad-1

#1

my code is not showing output

#2

You are not applying back tracking properly, you are passing the substring recursively and index too, that will lead to out of bound access, you have not stored anything in “store” yet you are printing it.
https://ide.codingblocks.com/s/189150
I have corrected your mistake.

#3

please see the problem sir

#4

@Adarshrajpandey i have seen the problem. I have already told you what were your mistakes, if you have any other doubt please ask.