Ref: 2 step by step diagrams added.

analysis/04-reverse-linked-list/diagrams/03_move_pointers.puml

@@ -0,0 +1,39 @@
+@startuml
+title Step 3 — Move previous and current
+
+object "Node 1" as n1 {
+  value = 1
+}
+
+object "Node 2" as n2 {
+  value = 2
+}
+
+object "Node 3" as n3 {
+  value = 3
+}
+
+n1 --> "null" : next
+n2 --> n3 : next
+n3 --> "null" : next
+
+object "previous" as prev
+object "current" as cur
+
+prev --> n1
+cur --> n2
+
+note right
+previous = current
+current  = next
+
+The reversed part is now:
+
+1 -> null
+
+The remaining original part is still:
+
+2 -> 3 -> null
+end note
+
+@enduml