I need help for java Longest common substring from code coach - hard

Question

It does not work for the last case.

Answer 1

It is called hard. You can search for it with tests of your code ie on Sololearn Playground with many different input data and see if the output correct is.

Answer 2

https://code.sololearn.com/cIo1vfG7fNc5/?ref=app

Answer 3

abcde abcdf sabcd
?