Feat/rust fix

[A5cend-dev]

Summary

This PR resolves CI failures caused by Rust syntax errors and formatting issues in the teachlink contract repository, blocking cargo fmt --all -- --check and build validation.

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Root Cause

CI was failing due to:

• A stray invalid line inside a disabled test block in escrow_repository.rs
• An extra unmatched } in concurrency_tests.rs
• Missing import causing build failure (Vec)

These issues caused Rust parser errors and prevented formatting/build checks from completing.

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Changes Made

escrow_repository.rs

• Fixed syntax issue in a commented-out test block by properly commenting/removing stray line:

  • beneficiary: beneficiary.clone(),

• Added missing import:

  • Vec from soroban_sdk

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concurrency_tests.rs

• Removed an extra trailing } causing unbalanced syntax in test module

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Validation

Formatting Check

cargo fmt --all -- --check

✔ Passed

Build Check

cargo build --workspace

✔ Passed

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Impact

• Restores CI pipeline health
• Ensures Rust formatting and parsing consistency
• No functional logic changes were introduced

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Notes

All fixes are minimal, syntax-only corrections with no behavior changes.

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Closes CI failure for cargo fmt --all -- --check and build validation.

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Issue	Title
#232	Fix race condition in concurrent approval scenarios	Link to this issue

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