lib/str: add NumToChar

1 files changed, 8 insertions, 0 deletions

diff --git a/lib/str.go b/lib/str.go
index 0191806..3c768ff 100644
--- a/lib/str.go
+++ b/lib/str.go
@@ -82,3 +82,11 @@ func isAlphaPunch(c byte) bool {
 	}
 	return false
 }
+
+func NumToChar(n int64) byte {
+	if 0 <= n && n <= 9 {
+		return byte(48 + n)
+	}
+	return 0
+}
+