Compatible with Go 1.15, fix unit test failed on Windows and fixed #689 potential race condition

1 files changed, 1 insertions, 1 deletions

diff --git a/lib.go b/lib.go
index acb4590..88aa3a1 100644
--- a/lib.go
+++ b/lib.go
@@ -167,7 +167,7 @@ func ColumnNumberToName(num int) (string, error) {
 	}
 	var col string
 	for num > 0 {
-		col = string((num-1)%26+65) + col
+		col = string(rune((num-1)%26+65)) + col
 		num = (num - 1) / 26
 	}
 	return col, nil