fix format

col.go

@@ -8,7 +8,7 @@ import (
 
 	"time"
 
-	"github.com/extrame/goyymmdd"
+	yymmdd "github.com/extrame/goyymmdd"
 )
 
 //content type
@@ -54,16 +54,15 @@ func (xf *XfRk) String(wb *WorkBook) string {
 		fNo := wb.Xfs[idx].formatNo()
 		if fNo >= 164 { // user defined format
 			if formatter := wb.Formats[fNo]; formatter != nil {
-				if (strings.Contains(formatter.str, "#") || strings.Contains(formatter.str, ".00")){
+				if strings.Contains(formatter.str, "#") || strings.Contains(formatter.str, ".00") {
 					//If format contains # or .00 then this is a number
 					return xf.Rk.String()
-				}else{
+				} else {
 					i, f, isFloat := xf.Rk.number()
 					if !isFloat {
 						f = float64(i)
 					}
 					t := timeFromExcelTime(f, wb.dateMode == 1)
-
 					return yymmdd.Format(t, formatter.str)
 				}
 			}

workbook.go

@@ -6,6 +6,7 @@ import (
 	"io"
 	"os"
 	"unicode/utf16"
+
 	"golang.org/x/text/encoding/charmap"
 )