Daily Expenses Sharing Application Objective: Design and implement a backend for a daily-expenses sharing application. This application will allow users to add expenses and split them based on three different methods: exact amounts, percentages, and equal splits. The application should manage user details, validate inputs, and generate downloadable balance sheets. Requirements: User Management: ✓ Each user should have an email, name, and mobile number. Expense Management: ✓ Users can add expenses. Expenses can be split using three methods: 1. Equal: Split equally among all participants. 2. Exact: Specify the exact amount each participant owes. 3. Percentage: Specify the percentage each participant owes. (Ensure percentages add up to 100%). Expense Calculation Examples: 1. Equal: Scenario: You go out with 3 friends. The total bill is 3000. Each friend owes 1000. 2. Exact: Scenario: You go shopping with 2 friends and pay 4299. Friend 1 owes 799, Friend 2 owes 2000

and you owe 1500. 3. Percentage: Scenario: You go to a party with 2 friends and one of your cousins. You owe 50%, Friend 1 owes 25%, and Friend 2 owes 25%. Balance Sheet: ✓ Show individual expenses. ✓ Show overall expenses for all users. ✓ Provide a feature to download the balance sheet. Deliverables: Backend Service: Design the backend service to handle user and expense management. API Endpoints: User Endpoints: ✓ Create user. ✓ Retrieve user details. Expense Endpoints: ✓ Add expense. ✓ Retrieve individual user expenses. ✓ Retrieve overall expenses. ✓ Download balance sheet. Data Validation: ✓ Validate user inputs. ✓ Ensure percentages in the percentage split method add up to 100%. Documentation: ✓ Include setup and installation instructions. ✓ Write clear and concise code comments. Evaluation Criteria: 1. Correctness: Functionality meets the requirements. 2. Code Quality: Code is clean, readable, and maintainable. 3. Documentation: Clear and comprehensive docume

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