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Income taxes (Tables)
12 Months Ended
Dec. 31, 2023
Income Tax Disclosure [Abstract]  
Schedule of income (loss) before income taxes
          
   Years Ended
December 31,
 
   2023   2022 
United States  $(50,029)  $758,130 
Hong Kong   (59,027   - 
China   1,800,059    - 
Total taxable income (loss)  $1,691,003   $758,130 
Schedule of reconciliation of income tax expense
          
   Years Ended
December 31,
 
   2023   2022 
Income (Loss) before income tax expenses  $1,691,003   $758,130 
Income tax expenses (benefits) computed at statutory tax rates   429,769    159,207 
Foreign tax rate differential        - 
Effect of deductible research and development expenses   8,267      
Effect of temporary differences   14,405      
Effect of change in valuation allowance   20,246    (159,207)
Income tax expenses (benefits)  $473,047   $-