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Business combination (Details)
Jun. 30, 2022
USD ($)
Business Combination and Asset Acquisition [Abstract]  
Consideration paid $ 1,340,903
Fair value of noncontrolling interest 966,862
Less: fair value of net assets of Shanghai Qishuo  
 Cash 36,369
 Other current assets 98,830
 Fixed assets 55,550
 Intangibles – customer relationship 172,514
 Other current liabilities (64,101)
Total fair value of net assets 299,162
Goodwill as of acquisition date $ 2,008,603