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#include <u.h>
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#include <libc.h>
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#include "String.h"
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String*
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s_unique(String *s)
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{
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	String *p;
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	if(s->ref > 1){
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		p = s;
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		s = s_clone(p);
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		s_free(p);
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	}
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	return s;
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}