Ref: 2 step by step diagrams added.

analysis/04-reverse-linked-list/diagrams/04_second_iteration.puml

@@ -0,0 +1,37 @@
+@startuml
+title Step 4 — Second Iteration After Reversing Node 2
+
+object "Node 1" as n1 {
+  value = 1
+}
+
+object "Node 2" as n2 {
+  value = 2
+}
+
+object "Node 3" as n3 {
+  value = 3
+}
+
+n2 --> n1 : next
+n1 --> "null" : next
+n3 --> "null" : next
+
+object "previous" as prev
+object "current" as cur
+object "next" as nxt
+
+prev --> n2
+cur --> n3
+nxt --> n3
+
+note bottom
+After processing Node 2:
+
+2 -> 1 -> null
+
+The reversed part grows from the front.
+The remaining part starts at current.
+end note
+
+@enduml