double linked list remove duplicate

Question

https://code.sololearn.com/c4BnHUN6S5uU

hi friends
here is my code

removing the duplicate in double linked list

for inputs like below ,i am not getting the output properly

if i insert data like this
2
3
4
4

then the duplicate of 4 is not removing
for other case it's removing
2
3
4
4
5

and

2
2
3
4
and
2
4
3
2

for these cases it's removing the duplicate ..
please suggest me the solution

Answer 1

Thank you very much ~ swim ~

Answer 2

Hahahaha.......okay my dear friend