Function dtoken::generate_dtoken

pub fn generate_dtoken(
    acc: &Address, 
    token_template_id: &[u8], 
    n: U128
) -> Vec<u8>

generate dtoken

when the user calls buy dtoken in marketplace contract, marketplace contract will call the generate_dtoken method of the contract to generate dtoken for the buyer

account is the buyer address

resource_id used to mark the only commodity in the chain

token_template_id used to mark the only token_template

n represents the number of generate tokens