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/calcchain.go b/calcchain.go
index a1f9c0c..1007de1 100644
--- a/calcchain.go
+++ b/calcchain.go
@@ -49,7 +49,7 @@ func (f *File) deleteCalcChain(index int, axis string) {
 	calc := f.calcChainReader()
 	if calc != nil {
 		calc.C = xlsxCalcChainCollection(calc.C).Filter(func(c xlsxCalcChainC) bool {
-			return !((c.I == index && c.R == axis) || (c.I == index && axis == ""))
+			return !((c.I == index && c.R == axis) || (c.I == index && axis == "") || (c.I == 0 && c.R == axis))
 		})
 	}
 	if len(calc.C) == 0 {