Worked fine on custom cases but showing run error on tet cae

#1
#2

@chemant077
dry run your code for 6
app
apple
application
batman
batmobile
cat
7
ap
bat
batcave
bat
cat
appl
appledore

the ans should be
app
apple
application
batman
batmobile
No suggestions
batcave
batman
batmobile
cat
apple
application
No suggestions

#3

its stopping when asked suggestions for bat again but working fine when am doing the same in custom case couldnt able to debug help

#4

@chemant077
refer to this code