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#ifndef __TCONFIG_H__struct tconfig_block {  char *key;  char *value;  struct tconfig_block *prev;  struct tconfig_block *next;  struct tconfig_block *parent;  struct tconfig_block *child;};struct tconfig_block *parse_config(const char *filename);void free_tconfig(struct tconfig_block *tcfg);#define __TCONFIG_H__#endif /* __TCONFIG_H__ */