Refactor golden files to follow xyz_log_ and xyz_src_ naming convention

v0/test.h

@@ -49,6 +49,11 @@ void assert_log_file(const char* filepath, const char* msg);
  */
 void assert_int(int expected, int actual, const char* msg);
 
+/**
+ * Reads the content of a file into a newly allocated string.
+ */
+char* read_file_content(const char* filepath);
+
 /**
  * Asserts that a condition is true.
  */