Excel data cleanup — Fictional demonstration

Fictional XLSX demonstration, not previous client work. Six input rows become four after trimming text and removing two exact duplicates. One missing email is flagged. Text ID 0001 and a formula-like literal label are preserved as text. Output includes a formatted table, filters, frozen header and change counts. Saved/reopened workbook checks verify values and original/output protection. Formula inputs are rejected. Python with openpyxl; AI-assisted development. Desktop Excel testing is not included.