This closes #1508, support SST index which contains blank characters

cell.go

@@ -564,7 +564,7 @@ func (c *xlsxC) getValueFrom(f *File, d *xlsxSST, raw bool) (string, error) {
 	case "s":
 		if c.V != "" {
 			xlsxSI := 0
-			xlsxSI, _ = strconv.Atoi(c.V)
+			xlsxSI, _ = strconv.Atoi(strings.TrimSpace(c.V))
 			if _, ok := f.tempFiles.Load(defaultXMLPathSharedStrings); ok {
 				return f.formattedValue(c.S, f.getFromStringItem(xlsxSI), raw)
 			}

cell_test.go

@@ -432,6 +432,11 @@ func TestGetValueFrom(t *testing.T) {
 	value, err := c.getValueFrom(f, sst, false)
 	assert.NoError(t, err)
 	assert.Equal(t, "", value)
+
+	c = xlsxC{T: "s", V: " 1 "}
+	value, err = c.getValueFrom(f, &xlsxSST{Count: 1, SI: []xlsxSI{{}, {T: &xlsxT{Val: "s"}}}}, false)
+	assert.NoError(t, err)
+	assert.Equal(t, "s", value)
 }
 
 func TestGetCellFormula(t *testing.T) {

stream.go

@@ -47,23 +47,23 @@ type StreamWriter struct {
 // 16MB. For example, set data for worksheet of size 102400 rows x 50 columns
 // with numbers and style:
 //
-//	file := excelize.NewFile()
+//	f := excelize.NewFile()
 //	defer func() {
-//	    if err := file.Close(); err != nil {
+//	    if err := f.Close(); err != nil {
 //	        fmt.Println(err)
 //	    }
 //	}()
-//	streamWriter, err := file.NewStreamWriter("Sheet1")
+//	sw, err := f.NewStreamWriter("Sheet1")
 //	if err != nil {
 //	    fmt.Println(err)
 //	    return
 //	}
-//	styleID, err := file.NewStyle(&excelize.Style{Font: &excelize.Font{Color: "777777"}})
+//	styleID, err := f.NewStyle(&excelize.Style{Font: &excelize.Font{Color: "777777"}})
 //	if err != nil {
 //	    fmt.Println(err)
 //	    return
 //	}
-//	if err := streamWriter.SetRow("A1",
+//	if err := sw.SetRow("A1",
 //	    []interface{}{
 //	        excelize.Cell{StyleID: styleID, Value: "Data"},
 //	        []excelize.RichTextRun{
@@ -80,30 +80,34 @@ type StreamWriter struct {
 //	    for colID := 0; colID < 50; colID++ {
 //	        row[colID] = rand.Intn(640000)
 //	    }
-//	    cell, _ := excelize.CoordinatesToCellName(1, rowID)
-//	    if err := streamWriter.SetRow(cell, row); err != nil {
+//	    cell, err := excelize.CoordinatesToCellName(1, rowID)
+//	    if err != nil {
+//	        fmt.Println(err)
+//	        break
+//	    }
+//	    if err := sw.SetRow(cell, row); err != nil {
+//	        fmt.Println(err)
+//	        break
+//	    }
+//	}
+//	if err := sw.Flush(); err != nil {
 //	    fmt.Println(err)
 //	    return
 //	}
-//	}
-//	if err := streamWriter.Flush(); err != nil {
-//	    fmt.Println(err)
-//	    return
-//	}
-//	if err := file.SaveAs("Book1.xlsx"); err != nil {
+//	if err := f.SaveAs("Book1.xlsx"); err != nil {
 //	    fmt.Println(err)
 //	}
 //
 // Set cell value and cell formula for a worksheet with stream writer:
 //
-//	err := streamWriter.SetRow("A1", []interface{}{
+//	err := sw.SetRow("A1", []interface{}{
 //	    excelize.Cell{Value: 1},
 //	    excelize.Cell{Value: 2},
 //	    excelize.Cell{Formula: "SUM(A1,B1)"}});
 //
 // Set cell value and rows style for a worksheet with stream writer:
 //
-//	err := streamWriter.SetRow("A1", []interface{}{
+//	err := sw.SetRow("A1", []interface{}{
 //	    excelize.Cell{Value: 1}},
 //	    excelize.RowOpts{StyleID: styleID, Height: 20, Hidden: false});
 func (f *File) NewStreamWriter(sheet string) (*StreamWriter, error) {
@@ -432,7 +436,7 @@ func (sw *StreamWriter) SetRow(cell string, values []interface{}, opts ...RowOpt
 // the 'SetColWidth' function before the 'SetRow' function. For example set
 // the width column B:C as 20:
 //
-//	err := streamWriter.SetColWidth(2, 3, 20)
+//	err := sw.SetColWidth(2, 3, 20)
 func (sw *StreamWriter) SetColWidth(min, max int, width float64) error {
 	if sw.sheetWritten {
 		return ErrStreamSetColWidth