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Create a command-line tool fixed calc that performs arithmetic operations on fixed-point decimal numbers…

Create a command-line tool fixed calc that performs arithmetic operations on fixed-point decimal numbers…: a task in TermGrade Environments: 1,004 executable Linux tasks (Harbor dataset). Input format: A CSV file with these columns in order: - id (integer, unique per file but not necessarily…

The task

**Input format:** A CSV file with these columns in order: - `id` (integer, unique per file but not necessarily sequential) - `date` (ISO 8601 date, various formats possible: `YYYY-MM-DD`, `YYYY-MM-DDTHH:MM:SS`, `YYYY-MM-DDTHH:MM:SSZ`, `YYYY-MM-DDTHH:MM:SS+HH:MM`, `YYYY-MM-DD HH:MM:SS` — all must be parsed correctly)…

Part of ai-and/termgrade-environments.