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Income taxes (Tables)
3 Months Ended
Mar. 31, 2024
Income Tax Disclosure [Abstract]  
Schedule of income (loss) before income taxes
          
   Three Months Ended
March 31,
 
   2024   2023 
United States  $(20,260)  $(9,397)
Hong Kong   (34,119     
China   886,888      
Total taxable income (loss)  $832,510   $(9,397)
Schedule of reconciliation of income tax expense
               
    Three Months Ended
March 31,
 
    2024     2023  
Income (Loss) before income tax expenses   $ 832,510     $ (9,397 )
Income tax expenses (benefits) computed at statutory tax rates     214,653       -  
Foreign tax rate differential     -       -  
Effect of deductible research and development expenses     -       -  
Effect of temporary differences     131       -  
Effect of change in valuation allowance     7,069        
Income tax expenses (benefits)   $ 221,853     $ -