Merge Sort giving segmentation fault

code-https://ide.codingblocks.com/s/239255

i cant figure out what is wrong in my code

@anubhavb11 in your llmid function, you are not checking if slow is NULL or not and also if fast->next is NULL or not before accessing them.

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i have added if statement now it is giving segmentation fault.
code- https://ide.codingblocks.com/s/239255