Feat/input

[nafsonig]

Implementation Complete ✅

I've successfully implemented strict validation on campaign initialization. Here's what was done:

1. Added Error Types (types.rs)

Added a comprehensive Error enum with five descriptive error variants:

• InvalidGoalAmount - when goal_amount ≤ 0
• InvalidEndTime - when end_time ≤ current ledger timestamp
• InvalidAssets - when accepted_assets is empty
• InvalidMilestones - when milestones aren't sorted or other milestone issues
• MilestoneMismatch - when last milestone.target_amount ≠ goal_amount

2. Implemented initialize() Function (lib.rs)

The function enforces all acceptance criteria in sequence:

1. goal_amount > 0 ✓ - Validates and panics with InvalidGoalAmount
2. end_time > current ledger timestamp ✓ - Uses env.ledger().timestamp() for comparison
3. accepted_assets non-empty ✓ - Validates and panics with InvalidAssets
4. milestones sorted ascending ✓ - Validates each milestone is greater than the previous
5. last milestone.target_amount == goal_amount ✓ - Ensures milestone alignment with goal
6. Descriptive error panics ✓ - Each validation panics with appropriate error symbols

3. Helper Functions

• validate_milestones() - Ensures milestones are properly sorted and the last equals goal_amount
• panic_with_error() - Converts error types to descriptive panic messages using env.panic_with_error()

Key Features:

• ✅ Validations occur in logical order (fail-fast approach)
• ✅ All inputs stored only after all validations pass
• ✅ Milestones stored individually in persistent storage
• ✅ Campaign initialized with Active status and 0 raised_amount
• ✅ Comprehensive error messages for debugging invalid deployments

The implementation prevents invalid campaigns from being deployed and provides clear error messaging for all failure scenarios.

Made changes.

closes #173

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[ayshadogo]

LGTM

Thank you for your contribution