[SC-003] Implement profile avatar URI update function in Registry

[ONEONUORA]

Description

Allow registered users to update their avatar URI in the user registry contract.

Files to Edit/Create

• contracts/contracts/user_registry/src/lib.rs

Acceptance Criteria

• Require authorization from the user's address.
• Store the avatar URI mapping successfully.

Guidance / Hints

Call user.require_auth() before writing update.

[stacyelliott492-star]

@stacyelliott492-star has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

HELLO DEAR I WOULD LOVE TO WORK ON THIS ISSUE PLEASE HELP THE NEEDY

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[oncleweynom]

@oncleweynom has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

hi maintainer would love to be assigned to this

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[TochukwuJustice]

@TochukwuJustice has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi, I would like to contribute to this issue. I’m a smart contract and backend dev working mostly with Solidity, TypeScript, and secure EVM setups. My focus is always on writing clean, gas-optimized, production-ready code without adding unnecessary clutter. I'll dive straight into fixing just this specific issue, document everything clearly, and make sure not to touch or disrupt anyone else's work.

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

[drips-wave]

Congratulations, @TochukwuJustice! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @TochukwuJustice: 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.

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[ONEONUORA]

@TochukwuJustice PLs update on this issue
You will be unassign in 6hrs