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, 2 insertions, 1 deletions

diff --git a/comment.go b/comment.go
index 0e3945d..23f1079 100644
--- a/comment.go
+++ b/comment.go
@@ -115,7 +115,8 @@ func (f *File) AddComment(sheet, cell, format string) error {
 		drawingVML = strings.ReplaceAll(sheetRelationshipsDrawingVML, "..", "xl")
 	} else {
 		// Add first comment for given sheet.
-		sheetRels := "xl/worksheets/_rels/" + strings.TrimPrefix(f.sheetMap[trimSheetName(sheet)], "xl/worksheets/") + ".rels"
+		sheetXMLPath, _ := f.getSheetXMLPath(sheet)
+		sheetRels := "xl/worksheets/_rels/" + strings.TrimPrefix(sheetXMLPath, "xl/worksheets/") + ".rels"
 		rID := f.addRels(sheetRels, SourceRelationshipDrawingVML, sheetRelationshipsDrawingVML, "")
 		f.addRels(sheetRels, SourceRelationshipComments, sheetRelationshipsComments, "")
 		f.addSheetNameSpace(sheet, SourceRelationship)