strip reasoning (now that tags are strings and not regexes)

Author: ochafik

common/chat-parser.cpp

@@ -129,17 +129,18 @@ void common_chat_msg_parser::consume_literal(const std::string & literal) {
 
 bool common_chat_msg_parser::try_parse_reasoning(const std::string & start_think, const std::string & end_think) {
     auto handle_reasoning = [&](const std::string & reasoning, bool closed) {
-        if (reasoning.empty()) {
+        auto stripped_reasoning = string_strip(reasoning);
+        if (stripped_reasoning.empty()) {
             return;
         }
         if (syntax_.reasoning_in_content) {
             add_content(syntax_.reasoning_format == COMMON_REASONING_FORMAT_DEEPSEEK ? "<think>" : start_think);
-            add_content(reasoning);
+            add_content(stripped_reasoning);
             if (closed) {
                 add_content(syntax_.reasoning_format == COMMON_REASONING_FORMAT_DEEPSEEK ? "</think>" : end_think);
             }
         } else {
-            add_reasoning_content(reasoning);
+            add_reasoning_content(stripped_reasoning);
         }
     };
     if (syntax_.reasoning_format != COMMON_REASONING_FORMAT_NONE) {