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Related party balances and transactions (Details 1) - USD ($)
Jun. 30, 2023
Dec. 31, 2022
Related Party Transaction [Line Items]    
Due from related parties $ 13,791 $ 29,983
Due to related parties 19,352 53,671
Ji Meng [Member]    
Related Party Transaction [Line Items]    
Due from related parties 10,439
Due to related parties 5,516
Zuogang Luo [Member]    
Related Party Transaction [Line Items]    
Due from related parties 13,791 19,544
Zhiguo Li [Member]    
Related Party Transaction [Line Items]    
Due to related parties 11,230 6,223
Qi Gu [Member]    
Related Party Transaction [Line Items]    
Due to related parties 2,606 3,030
Yimin Wu [Member]    
Related Party Transaction [Line Items]    
Due to related parties 36,664
Weimin Wu [Member]    
Related Party Transaction [Line Items]    
Due to related parties 4,619
Shengmin Wu [Member]    
Related Party Transaction [Line Items]    
Due to related parties $ 3,135