Insert(L,e)
Insert(L,e)
Procedure to insert a node with information e before the
current position or, in case L was empty, as the only
node in L; the new node becomes the current node;
InsertAfter(L,e)
Procedure to insert a node with information e into L
after the current node without changing the current
position; in case L, make a node containing e the only
node in L and the current node;