chore: remove unused headers and code cleanup

Author: github-roushan

engine/utils/hardware/gguf/ggml.h

@@ -2,7 +2,6 @@
 #include <stdint.h>
 #include <string>
 #include <unordered_map>
-#include "utils/result.hpp"
 
 namespace hardware {
 enum GGMLType {

engine/utils/hardware/gguf/gguf_file.h

@@ -24,7 +24,6 @@
 
 #include "ggml.h"
 #include "utils/logging_utils.h"
-#include "utils/string_utils.h"
 
 // #define GGUF_LOG(msg)                                                  \
 //   do {                                                                 \
@@ -62,7 +61,6 @@ enum GGUFMetadataValueType : uint32_t {
   GGUFMetadataValueTypeUint64,
   GGUFMetadataValueTypeInt64,
   GGUFMetadataValueTypeFloat64,
-  _GGUFMetadataValueTypeCount  // Unknown
 };
 
 struct GGUFMetadataKV {
@@ -292,10 +290,9 @@ struct GGUFHelper {
 
   std::string ReadString() {
     auto l = Read<uint64_t>();
-    std::string res(reinterpret_cast<const char*>(data), l);
-    auto r = res;
+    std::string result(reinterpret_cast<const char*>(data), l);
     data += l;
-    return r;
+    return result;
   }
 
   GGUFMetadataKVArrayValue ReadArray() {