Turn supplied CSV or plain-data Excel files into consistent outputs with a clear record of changes. I can merge agreed files, map differing columns, trim specified text fields, remove exact duplicates when requested, and flag missing or conflicting values for review. Ambiguous values are reported for your decision. You receive the cleaned file, separate review output where needed, and a concise report explaining the applied rules. Source files are preserved. Spreadsheet formatting, formulas and platform-specific imports are reviewed separately before quoting. Send a small anonymized sample, expected output columns, approximate row counts and your cleanup rules. We agree on the scope, price and delivery time before work starts. All project communication is handled in writing through Contra messages.