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Convertible notes payable (Details Narrative)
12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
CNY (¥)
Oct. 14, 2024
CNY (¥)
Oct. 07, 2024
shares
Aug. 01, 2024
shares
Jun. 05, 2024
shares
Feb. 27, 2024
shares
Dec. 31, 2023
CNY (¥)
Convertible Notes Payable                  
Convertible Notes Payable $ 20,740,480   ¥ 149,090,866           ¥ (0)
Convertible payable issued 97,630,000 ¥ 701,803,492              
Converted to shares $ 76,889,520 ¥ 552,712,626              
Aggregate principal amount | shares         20,000,000 30,000,000 30,000,000 11,000,000  
Convertible note principal amount       ¥ 5,000,000          
Convertible notes payable     ¥ 20,000,000