Rename variables

Author: Neodelf

2/add_two_numbers.rb

@@ -11,20 +11,20 @@
 # @param {ListNode} l2
 # @return {ListNode}
 def add_two_numbers(l1, l2)
-    ll_common = ListNode.new(nil)
-    ll = ll_common
+    ln_result = ListNode.new(nil)
+    ln = ln_result
     next_is_present = true
     while next_is_present
         next_is_present = l1&.next || l2&.next
-        ll_val = l1&.val.to_i + l2&.val.to_i + ll&.val.to_i
-        int = ll_val/10
+        ln_val = l1&.val.to_i + l2&.val.to_i + ln&.val.to_i
+        int = ln_val/10
 
-        ll.val = int > 0 ? ll_val - 10 : ll_val
-        ll.next = ListNode.new(int) if next_is_present || int > 0
+        ln.val = int > 0 ? ln_val - 10 : ln_val
+        ln.next = ListNode.new(int) if next_is_present || int > 0
 
         l1 = l1.next if l1
         l2 = l2.next if l2
-        ll = ll.next
+        ln = ln.next
     end
-    ll_common
+    ln_result
 end