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/excelize.go b/excelize.go
index da51b13..6603db0 100644
--- a/excelize.go
+++ b/excelize.go
@@ -230,7 +230,7 @@ func (f *File) workSheetReader(sheet string) (ws *xlsxWorksheet, err error) {
 		name string
 		ok   bool
 	)
-	if name, ok = f.sheetMap[trimSheetName(sheet)]; !ok {
+	if name, ok = f.getSheetXMLPath(sheet); !ok {
 		err = fmt.Errorf("sheet %s is not exist", sheet)
 		return
 	}