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 #ifndef HELLO_H
 #define HELLO_H
 
 void hello(const char *name);
 
 #endif //HELLO_H
 ³ÌÐò2: hello.c
 #include <stdio.h>
 
 void hello(const char *name)
 {
  printf("Hello %s!\n", name);
 }
  ³ÌÐò3: main.c
 #include "hello.h"
 
 int main()
 {
  hello("everyone");
  return 0;
 }
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