ll
- head
- last
- curr
ausgangslage:
head -> l1
curr -> l1
last -> l4
l1
nx -> l2
nx -> l3
nx -> l4
nx -> null
remove l1:
head -> l2 <<
curr -> l2 <<
l2
nx -> l3
nx > l4
nx -> null
remove l2:
l1
nx -> l3
nx -> l4
nx -> null
remove l4:
last-> l3
l1
nx -> l2
nx -> l3
nx -> null