[fix] add #include guard to tagger.h
+#ifndef TAGGER_H
+#define TAGGER_H
+
#include "string_utils.h"
#include "tokens.h"
// Arguments: tagger, context, tokenized str, index
typedef bool (*tagger_feature_function)(void *, void *, tokenized_string_t *, uint32_t);
+
+#endif
