char *my_tok(char *first, char *t)
{
        int pos=0;

        /* If given a string, start over here */
        if(first != NULL)       last=first;

        first=last;     /* Pick up wherever we left off */

        /* Our very first char is NULL?  Give up. */
        if(first[0] == '\0') return(NULL);

        /* Increment 'pos' until we find c or NULL */
        while(first[pos])
        {
                int n;
                // Check for, and stop at, any token character.
                for(n=0; t[n]; n++) if(first[pos]==t[n]) break;

                //if we found a token, t[n] won't be NULL.
                if(t[n]) break; // Stop at token char
        }

        /**
         * If we found a separator, replace it with a NULL terminator
         * The string beginning in 'first' will now stop early, here.
         *
         * A 'while' loop is used to catch several in a row.
         */
        while(1)
        {
                int n;
                first[pos]='\0';
                pos++;
                for(n=0; t[n]; n++) if(first[pos] == t[n]) break;
                // Rerun while loop if we found another token char
                if(t[n]) continue; 
                break; // Leave the loop if we did not.
        }

        // Remember exactly where we left off.
        last += pos;

        // Return a pointer to where we started.
        return(first);
}