strrchr.c

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#include <string.h>
 
char* strrchr(const char* s, int c)
{
    size_t i = 0;
 
    while (s[i++])
    {
        /* EMPTY */
    }
 
    do
    {
        if (s[--i] == (char)c)
        {
            return (char*)s + i;
        }
    } while (i);
 
    return NULL;
}