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#include <string.h>
char *strchr(const char *s, int c) {
do {
if ((char)c == *s)
return (char*)s;
} while (*s++ != '\0');
return NULL;
}
char *strrchr(const char *s, int c)
{
const char *last = NULL;
do {
if (*s == (char)c)
last = s;
} while (*s++);
return (char *)last;
}
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