text: #ifndef STACK_H
  #define STACK_H
  #include <stdbool.h>
  
  struct Stack{
      char **items;
      int size;
  };
  
  void create_empty_stack(struct Stack *st);
  void push(struct Stack *st, char *item);
  void pop(struct Stack *st);
  char* peek(struct Stack *st);
  bool isEmpty(struct Stack *st);
  
  #endif