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#include <string.h>
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char*
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strchr(const char *s, int c)
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{
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	char c1;
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	if(c == 0) {
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		while(*s++)
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			;
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		return s-1;
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	}
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	while(c1 = *s++)
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		if(c1 == c)
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			return s-1;
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	return 0;
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}