Just a warning to anyone writing this in C# c sharp: there is an error in the main function that makes solving this problem using C# impossible.

PrintSinglyLinkedList(llist->head, "\n", textWriter);

should be

PrintSinglyLinkedList(llist.head, "\n", textWriter);

Here is my c++ solution you watch vide explanation here : https://youtu.be/COnfpdhOlN8

SinglyLinkedListNode* insertNodeAtHead(SinglyLinkedListNode* llist, int data) {
   SinglyLinkedListNode* new_node = new SinglyLinkedListNode(data);
   new_node -> next = llist;
   return new_node;
}

here's my solution in C language:

SinglyLinkedListNode* insertNodeAtHead(SinglyLinkedListNode* llist, int data) { SinglyLinkedListNode* node = malloc(sizeof(SinglyLinkedListNode)); node->data = data; node->next = llist; llist = node; return llist; }

It must be something wrong with the task. The constrains says that the lsit is not null and data is not null. So I made a simple code:

     SinglyLinkedListNode node =new SinglyLinkedListNode(data);
     node.next=llist;
     return node; 

             But I run in a bunch of nullable errors. 
             Also the explanation looks like an explanation from some other task.

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