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  1. or download this
    c_func(undef); # NULL param
c_func('');    # empty string param
c_func(123);   # string '123' param
c_func('qwe'); # string 'qwe' param
  2. or download this
    void
c_func(param)
    char *    param = SvOK(ST(0)) ? SvPV_nolen(ST(0)) : NULL;