fix sprintf WIP

Author: fglock

src/main/java/org/perlonjava/operators/SprintfFormatParser.java

@@ -323,7 +323,7 @@ void validateSpecifier(FormatSpecifier spec) {
             // Check for vector formats FIRST (before %n check)
             if (spec.vectorFlag) {
                 // Vector flag is only valid with certain conversions
-                String validVectorConversions = "diouxXbBs";
+                String validVectorConversions = "diouxXbB";  // Remove 's'
                 System.err.println("DEBUG: Checking vector conversion '" + spec.conversionChar +
                       "' in '" + validVectorConversions + "'");
                 if (validVectorConversions.indexOf(spec.conversionChar) < 0) {

src/main/java/org/perlonjava/operators/SprintfOperator.java

@@ -338,8 +338,6 @@ private static int updateArgIndex(SprintfFormatParser.FormatSpecifier spec,
      * Handle invalid format specifiers.
      */
     private static String handleInvalidSpecifier(SprintfFormatParser.FormatSpecifier spec) {
-        System.err.println("DEBUG handleInvalidSpecifier: raw='" + spec.raw +
-            "', errorMessage='" + spec.errorMessage + "'");
         String formatOnly = spec.raw;
         String trailing = "";
 
@@ -371,8 +369,6 @@ private static String handleInvalidSpecifier(SprintfFormatParser.FormatSpecifier
         }
 
         // Don't consume any arguments for invalid specifiers
-        // The caller should NOT update argIndex for invalid formats
-
         return formatOnly + trailing;
     }