Program to remove duplicate elements from the sorted linked list

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Iam going to give just the function of above program but not the whole program.The function is explained at each line using comment line.

void removeduplicates(struct node* head)
{
struct node* curr=head;                         // Make head as current node
struct node node_next_to_next;
if(curr==NULL)
return;
while(curr->next!=NULL)                     //Iterate up to the end of the linked list
{
if(curr->data==curr->next->data)         // compare the data of node to its next node in the linked list
{
node_next_to_next=curr->next->next;  // if its equal then make next_to_next node as curr->next->next
free(curr->next);                                   // and delete the curr->next node
curr->next=node_next_to_next;            // Now make curr->next node as node_next_to_next.
}                                                          // Thus removing the duplicate element.
else
curr=curr->next;                                   // If its not equal just make curr as curr->next
}
}

Input: 

4->12->12->13->14->14->16

Output:

4->12->13->14->16

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