add json-c-0.16

zhangzengfei

2023-01-12 f03bf31433d44206d0d44a2f7621d70e0fb67d39

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new_obj.to_string()=[1.20,3.40,123456.78,5.00,23000000000.00]
new_obj.to_string()=[1.2,3.4,123456.78,5.0,2.3e10]