code: func (t *SimpleChaincode) delete(stub shim.ChaincodeStubInterface, args []string) pb.Response {
  	if len(args) != 1 {
  		return shim.Error("Incorrect number of arguments. Expecting 1")
  	}
  
  	A := args[0]
  
  	// Delete the key from the state in ledger
  	err := stub.DelState(A)
  	if err != nil {
  		return shim.Error("Failed to delete state")
  	}
  
  	return shim.Success(nil)
  }
docs: // Deletes an entity from state