fix runes index out of range

util.go

@@ -361,9 +361,13 @@ func printWithStyle(screen tcell.Screen, text string, x, y, maxWidth, align int,
 			width += w
 			start = index
 		}
+
+		if len(runes) > 0 {
 			for runewidth.RuneWidth(runes[start]) == 0 && start < len(runes) {
 				start++
 			}
+		}
+
 		return printWithStyle(screen, substring(start, len(runes)), x+maxWidth-width, y, width, AlignLeft, style)
 	} else if align == AlignCenter {
 		width := runewidth.StringWidth(strippedText)