using System;

using System.Linq;

using System.Text.Json;

public class Program

{

    public static void Main()

    {

        var d = new[]

        {

            new

            {

                name = "agent1",

                CurencyName = "Currency1",

                Debtor = 20,

                Creditor = 0

            },

            new

            {

                name = "agent1",

                CurencyName = "Currency2",

                Debtor = 0,

                Creditor = 10

            },

            new

            {

                name = "agent2",

                CurencyName = "Currency1",

                Debtor = 0,

                Creditor = 50

            },

            new

            {

                name = "agent2",

                CurencyName = "Currency2",

                Debtor = 0,

                Creditor = 10

            },

        };

    var results = d.GroupBy(

        d => d.name,

        d => new

            {

                d.name,

                currency1Debtor = d.CurencyName == "Currency1" ? d.Debtor : 0,

                currency1Creditor = d.CurencyName == "Currency1" ? d.Creditor : 0,

                currency2Debtor = d.CurencyName == "Currency2" ? d.Debtor : 0,

                currency2Creditor = d.CurencyName == "Currency2" ? d.Creditor : 0,

            },

        (name, g)  => new

            {

                name,

                currency1Debtor = g.Sum(d => d.currency1Debtor),

                currency1Creditor = g.Sum(d => d.currency1Creditor),

                currency2Debtor = g.Sum(d => d.currency2Debtor),

                currency2Creditor = g.Sum(d => d.currency2Creditor),

            });

        Console.WriteLine(JsonSerializer.Serialize(results, new JsonSerializerOptions { WriteIndented = true }));

    }

}