Module utils 

Functions

cell_pos_to_address

Converts a 1-based (row, col) pair to an Excel A1 address string.

col_to_label

Converts a 1-based column index to an Excel column label (e.g. 1 → “A”, 27 → “AA”).

diff_range

Returns the bounding rectangle that covers both ranges.

filter_same_name_sheets

Returns sheets whose names appear in both lists, preserving old workbook order.