largest common substring Founder

Question

question is available in sololearn code coach ,i have made 5 test cases to pass but the 6th failed ,i cant handle it as i dont know the question argument help me

Answer 1

SAHIL RAJ copy and paste your code into a code-bit and show us what you have attempted so far ...

https://www.sololearn.com/discuss/333866/?ref=app

Answer 2

if there's no common longest substring found, then the substring is the most repeated single character which length is 1.