Deduplicate Stellar addresses case-insensitively in recipientDeduplicator

[Kingsman-99]

Description

recipientDeduplicator uses strict string equality to detect duplicate recipients. Because Stellar account IDs are case-sensitive by spec but users sometimes supply mixed-case variations, duplicates slip through and cause double-payment.

Acceptance Criteria

• Deduplication normalises addresses to uppercase before comparison
• The original casing of the first occurrence is preserved in the output
• Subsequent duplicates (regardless of case) are removed and reported in the dedup summary
• Unit tests pass

Context

• Target file: src/validators/recipientDeduplicator.ts
• Stellar G-addresses are base32 and uppercase by convention; normalise to uppercase

[meezoq2006]

@meezoq2006 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi, I went through this and I’d like to take it.

The case difference thing is pretty easy to miss, but I can see how it could lead to the same recipient being picked up twice. I’ll update the comparison to normalise the addresses while still keeping the first one exactly as it was, and make sure the duplicates are still reflected in the summary.

I’ll add the tests for the mixed-case cases too. Please assign it to me.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @meezoq2006 to this issue.

[samsonmbah002]

@samsonmbah002 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Good day can i work on these.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @samsonmbah002 to this issue.

[drips-wave]

Congratulations, @samsonmbah002! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @samsonmbah002: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@samsonmbah002's PR #790 was approved and merged by @Kingsman-99.

🏆 @samsonmbah002: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (780 total points). Track your full progress on GrantFox.

👏 Great work, @samsonmbah002! Keep contributing to Stellar-split.

[drips-wave]

This issue has been completed by @samsonmbah002 as part of the Stellar Wave Program's 8th Wave 🥳

😎 @samsonmbah002: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.