graph TD A[Start: Receive CSV Data] --> B[Initialize Skill #190] B --> C{Check Output Format} C -->|CSV Format| D[Process CSV Data] C -->|XLSX Format| E[Process for Base64 Conversion] D --> F[Add Crescent Technical Branding] E --> F F --> G{Validate Output} G -->|Valid| H[Generate Final Output] G -->|Invalid| B H --> I[Return Formatted Spreadsheet] I --> J[End: Ready for Download]