fixed_cost value does not accumulate

[diogoftm]

For multiple entries under lots with the same symbol, only the first fixed_cost is being considered. This has two implications, first the value of fixed_cost does not accumulate for the same symbol and, second, if fixed_cost is only introduced in the second or later instance of a symbol in the lots, its value is completly ignored.

To Reproduce
Using this configuration that is basically the one in the README.md:

lots:
  - symbol: "ARKW"
    quantity: 20.0
    unit_cost: 100
  - symbol: "ARKW"
    quantity: 20.0
    unit_cost: 100
    fixed_cost: 7.00

The cost displayed is 4000 instead of the expected 4007.

Also, if using this configuration:

lots:
  - symbol: "ABNB"
    quantity: 35.0
    unit_cost: 100.00
    fixed_cost: 2.00
  - symbol: "ABNB"
    quantity: 70.0
    unit_cost: 50.00
    fixed_cost: 3.00

The cost that is displayed is 7002 instead of 7005.

Expected behavior
fixed_cost of all entries under lots should be considered and accumulate across multiple entries for the same symbol.

Environment:

• ticker Version: v4.7.1

Possible solution

Change line 160 in asset.go from:

aggregatedLot.Cost += lot.Quantity * lot.UnitCost

to:

aggregatedLot.Cost += lot.Quantity*lot.UnitCost + lot.FixedCost