Sort List

Sort a linked list in O(n log n) time using constant space complexity.

Example :

Input : 1 -> 5 -> 4 -> 3

Returned list : 1 -> 3 -> 4 -> 5
NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt? Checkout Sample Codes for more details.
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