Context

A bank has a portfolio of thousands of trades and they need to be categorized. A trade is a commercial negotiation between a bank and a client. Each trade has a value that indicates the transaction amount in dollars and a text indicating if the client´s sector is "Public" or "Private". They implement the following interface:

interface ITrade
{
    double Value { get; }
    string ClientSector { get; }
}

Currently, there are three categories:

• LOWRISK: Trades with value less than 1,000,000 and client from Public Sector

• MEDIUMRISK: Trades with value greater than 1,000,000 and client from Public Sector

• HIGHRISK: Trades with value greater than 1,000,000 and client from Private Sector

Imagine you receive a list of trades and you need to return a list of categories as below:

input: List<ITrade> portfolio

output: List<string> tradeCategories

Example:

Input:

Trade1 { Value = 2000000; ClientSector = "Private" }
Trade2 { Value = 400000; ClientSector = "Public" }
Trade3 { Value = 500000; ClientSector = "Public" }
Trade4 { Value = 3000000; ClientSector = "Public" }

portfolio = { Trade1, Trade2, Trade3, Trade4 }

  Output:

tradeCategories = { "HIGHRISK", "LOWRISK", "LOWRISK", "MEDIUMRISK" }

Keep in mind that category rules may be added/removed/modified in the future and be highly complex.

Project file structure

Output