Fix potential file corrupted and change worksheet name case-insensitive

- Using sheet ID instead of sheet index when delete the cell in calculation chain
- Update documentation for exported functions
- Using `sheet` represent the sheet name in the function parameters

1 files changed, 1 insertions, 1 deletions

diff --git a/pivotTable.go b/pivotTable.go
index 10c48ce..73e5d34 100644
--- a/pivotTable.go
+++ b/pivotTable.go
@@ -190,7 +190,7 @@ func (f *File) parseFormatPivotTableSet(opt *PivotTableOption) (*xlsxWorksheet,
 	if err != nil {
 		return dataSheet, "", err
 	}
-	pivotTableSheetPath, ok := f.sheetMap[trimSheetName(pivotTableSheetName)]
+	pivotTableSheetPath, ok := f.getSheetXMLPath(pivotTableSheetName)
 	if !ok {
 		return dataSheet, pivotTableSheetPath, fmt.Errorf("sheet %s is not exist", pivotTableSheetName)
 	}