rem: struct Node *FindNode(struct List *list, struct Node *node)
add: FindNode ( struct List *list, struct Node *node )
context: struct Node *FindNode(struct List *list, struct Node *node){  struct Node *currentnode;  for(currentnode = list->lh_Head;      currentnode->ln_Succ;      currentnode = currentnode->ln_Succ)  {    if(currentnode == node)    {      return currentnode;    }  }  return NULL;}