feat: cleaned the pr

Author: brunomiguelpinto

app/services/billing/rate_cards/schedule.rb

@@ -51,15 +51,17 @@ def initialize(anchor_date:, phases:, rates:, prorated:, timezone:, starts_at:,
       end
 
       def cycles_due_by(timestamp)
-        walk(timestamp).first
+        due, _pending = walk(timestamp)
+        due
       end
 
       def cycles_overlapping(range)
         cycles_due_by(range.end).select { |cycle| cycle.ended_at > range.begin && cycle.started_at < range.end }
       end
 
       def due_after(timestamp)
-        walk(timestamp).last&.due_at
+        _due, pending = walk(timestamp)
+        pending&.due_at
       end
 
       def next_billing_at(timestamp)