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#ifndef STACK_H
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#define STACK_H
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typedef struct stack_elem {
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void *value;
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struct stack_elem *next;
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} stack_elem;
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typedef struct stack {
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struct stack_elem *first;
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} stack;
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stack* create_stack(void);
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void save(void *d, stack *s);
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void* restore(stack *s);
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#endif
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