Crack width calculation was added

StructureHelperLogics/NdmCalculations/Cracking/EquivalentDiameterLogic.cs

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+using LoaderCalculator.Data.Ndms;
+using StructureHelperCommon.Infrastructures.Exceptions;
+using StructureHelperCommon.Models.Loggers;
+using StructureHelperCommon.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StructureHelperLogics.NdmCalculations.Cracking
+{
+    public class EquivalentDiameterLogic : IAverageDiameterLogic
+    {
+        public IEnumerable<RebarNdm> Rebars { get; set; }
+        public IShiftTraceLogger? TraceLogger { get; set; }
+
+        public double GetAverageDiameter()
+        {
+            TraceLogger?.AddMessage(LoggerStrings.CalculatorType(this), TraceLogStatuses.Service);
+            Check();
+            var rebarArea = Rebars
+                .Sum(x => x.Area);
+            TraceLogger?.AddMessage($"Summary rebar area As = {rebarArea}(m^2)");
+            var rebarCount = Rebars.Count();
+            TraceLogger?.AddMessage($"Rebar count n = {rebarCount}");
+            var averageArea = rebarArea / rebarCount;
+            TraceLogger?.AddMessage($"Equivalent rebar area As,eq = {averageArea}");
+            var diameter = 2d * Math.Sqrt(averageArea / Math.PI);
+            TraceLogger?.AddMessage($"Equivalent rebar diameter ds,eq = 2 * Sqrt( PI / As,eq) = 2 * Sqrt( PI / {averageArea}) = {diameter}(m)");
+            return diameter;
+        }
+        private void Check()
+        {
+            if (!Rebars.Any())
+            {
+                string errorString = ErrorStrings.DataIsInCorrect + $": rebars count must be greater then zero";
+                TraceLogger?.AddMessage(errorString, TraceLogStatuses.Error);
+                throw new StructureHelperException(errorString);
+            }
+        }
+    }
+}