add json-c-0.16

zhangzengfei

2023-01-12 f03bf31433d44206d0d44a2f7621d70e0fb67d39

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string_of_digits
"123"
regular_number
222
decimal_number
99.55
boolean_true
true
boolean_false
false
big_number
2147483649
a_null
null