adding an edge case missed in linked list remove_nth_node_from_end.py #457
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… - when length of linked list and N is same current code throws Error
sshsrijanr
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Case when the length of the linked list and N is equal
Description
In the Linked List Problem of Removing nth Node from the End, One of the cases was missed where the length of the linked list is equal to n, In this case, the current code throws AttributeError: 'NoneType' object has no attribute 'next'
Fixes # (issue)
Type of change