Clean up Thinking Block from json-markup

Author: igordayen

embabel-common-core/src/main/kotlin/com/embabel/common/core/thinking/spi/thinkingBlocksExtraction.kt

@@ -108,7 +108,7 @@ fun extractAllThinkingBlocks(input: String): List<ThinkingBlock> {
     // Extract remaining content before JSON
     val noPrefixPattern = "^(.*?)(?=\\{)".toRegex(RegexOption.DOT_MATCHES_ALL)
     noPrefixPattern.find(remainingInput.trim())?.let { match ->
-        val content = match.groupValues[1].trim()
+        val content = skipMarkdownArtifacts(match.groupValues[1].trim())
         if (content.isNotEmpty()) {
             blocks.add(
                 ThinkingBlock(
@@ -122,3 +122,14 @@ fun extractAllThinkingBlocks(input: String): List<ThinkingBlock> {
 
     return blocks.sortedBy { input.indexOf(it.content) }
 }
+
+/**
+ * Remove markdown artifacts that should not be considered thinking content.
+ * Currently handles ```json code fence markers that commonly appear before JSON output,
+ * see get format in [[JacksonConverter]]
+ */
+private fun skipMarkdownArtifacts(content: String): String {
+    return content
+        .replace("```json", "")
+        .trim()
+}