Problem merge sorted linked list

#1

link to solution
I cannot find error in the code i tried different test cases it passed but when i sbmmited it only 1 test case passed

#2

https://ide.codingblocks.com/s/179892 link

#3

try to dry run your code for
1
2
1 3
0

#4

as you have not replied for 7 days iā€™m marking your doubt as resolved.if u have any query u can re open it