How do I implement this function in a sequence class with a linked list toolkit?

// void remove_current( )
// Precondition: is_item returns true.
// Postcondition: The current item has been removed from the sequence, and the
// item after this (if there is one) is now the new current item.

Question

How do I implement this function in a sequence class with a linked list toolkit? 

// void remove_current( )
// Precondition: is_item returns true.
// Postcondition: The current item has been removed from the sequence, and the
// item after this (if there is one) is now the new current item.

anonymous · Answer

void sequence::remove_current () {

if (is_item ==true) 

node *target_ptr; 
target_ptr=list_search(head_ptr, target); 
if (target_ptr == NULL)
return false; 
target_ptr-> set_data(head_ptr-> data()); 
list_head_remove(head_ptr); 
--many nodes; 
return true; 

} 


}

How do I fix my code above?