strchr.c

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char *strchr(const char *s, int c)
{
    for (; *s != '\0'; s++)
    {
        if (*s == (const char)c)
        {
            return (char *)s;
        }
    }

    if ((const char)c == *s)
    {
        return (char *)s;
    }

    return 0;
}