Function SzConfigTool_addDistinctFunction 

#[unsafe(no_mangle)]
pub extern "C" fn SzConfigTool_addDistinctFunction(
    config_json: *const c_char,
    dfunc_code: *const c_char,
    connect_str: *const c_char,
    dfunc_desc: *const c_char,
    language: *const c_char,
) -> SzConfigTool_result

Add a distinct function