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Summary of significant accounting policies (Details 5)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Total $ 2,446,714 ¥ 17,587,961 ¥ 3,797,862
Shanghai Weimu [Member]      
Total 625,318 4,495,040 3,065,579
Viwo Tech [Member]      
Total 1,821,396 13,092,921 741,356
Vize Technology Limited [Member]      
Total ¥ (9,073)