Works as intended

HorseRace/Horse.cs

@@ -1,10 +1,14 @@
-namespace HorseRace;
+using System.ComponentModel;
+
+namespace HorseRace;
 
 public sealed class Horse
 {
     public Horse(string name, int age, int startNo)
     {
-        // TODO
+        Name = name;
+        Age = age;
+        StartNumber = startNo;
     }
 
     public int Age { get; }
@@ -21,8 +25,15 @@ public sealed class Horse
     /// <returns>The position difference between two horses</returns>
     public int CompareTo(Horse other)
     {
-        // TODO
+        int positionDifference = other.Position - Position;
-        return -1;
+        int startNumberDifference = other.StartNumber - StartNumber;
+        
+        if(positionDifference != 0)
+        {
+            return positionDifference;
+        }
+        
+        return startNumberDifference;
     }
 
     /// <summary>
@@ -31,7 +42,15 @@ public sealed class Horse
     /// </summary>
     public void Draw()
     {
-        // TODO
+        const int MaxSteps = HorseRace.MaxSteps;
+        const char HorseSymbol = '*';
+        
+        Console.Write($"Horse {StartNumber,2}:");
+        for (int i = 0; i < MaxSteps; i++)
+        {
+            Console.Write(Position == i ? HorseSymbol : " ");
+        }
+        Console.WriteLine("|");
     }
 
     /// <summary>
@@ -39,7 +58,12 @@ public sealed class Horse
     /// </summary>
     public void Move()
     {
-        // TODO
+        if (RandomProvider.Random.Next(0, 3) != 0)
+        {
+            return;
+        }
+
+        Position += 1;
     }
 
     /// <summary>
@@ -52,8 +76,67 @@ public sealed class Horse
     /// <returns>True if parsed successfully; false otherwise</returns>
     public static bool TryParse(string csvLine, int startNo, out Horse? horse)
     {
-        // TODO
         horse = null;
-        return false;
+        if (Contains(csvLine, ';') != 1)
+        {
+            return false;
+        }
+
+        if (startNo <= 0)
+        {
+            return false;
+        }
+        
+        string name = "";
+        int length = 0;
+        for (int i = 0; i < csvLine.Length; i++)
+        {
+            if (csvLine[i] == ';')
+            {
+                length = i;
+                break;
+            }
+
+            name += csvLine[i];
+        }
+
+        if (name == String.Empty)
+        {
+            return false;
+        }
+
+        string ageInString = "";
+        for (int i = length + 1; i < csvLine.Length; i++)
+        {
+            ageInString += csvLine[i];
+        }
+
+        if (!int.TryParse(ageInString, out int age))
+        {
+            return false;
+        }
+
+        if (age < 0 || age > 10)
+        {
+            return false;
+        }
+
+        horse = new Horse(name, age, startNo);
+
+        return true;
+
+        int Contains(string line, char character)
+        {
+            int total = 0;
+            for (int i = 0; i < line.Length; i++)
+            {
+                if (line[i] == character)
+                {
+                    total++;
+                }
+            }
+
+            return total;
+        }
     }
 }

HorseRace/HorseImporter.cs

@@ -1,11 +1,78 @@
-namespace HorseRace;
+using System.Security.AccessControl;
+
+namespace HorseRace;
 
 public static class HorseImporter
 {
     public static bool TryReadHorses(string filePath, out Horse[]? horses)
     {
-        // TODO
         horses = null;
-        return false;
+        if (!File.Exists(filePath))
-    } 
+        {
+            return false;
+        }
+        string[] lines = File.ReadAllLines(filePath);
+        if (lines.Length <= 1)
+        {
+            return false;
+        }
+        
+        return FormatLines(lines, out horses);
+    }
+
+    private static bool FormatLines(string[] lines, out Horse[]? horses)
+    {
+        lines = RemoveFirstLine(lines);
+        horses = new Horse[lines.Length];
+        for (int i = 0; i < lines.Length; i++)
+        {
+            Horse.TryParse(lines[i], i + 1, out horses[i]!);
+        }
+
+        horses = TrimNullHorses(horses);
+        
+        if (horses.Length == 0)
+        {
+            horses = Array.Empty<Horse>();
+            return false;
+        }
+
+        return true;
+        
+        string[] RemoveFirstLine(string[] array)
+        {
+            string[] changedArray = new string[array.Length - 1];
+            for (int i = 0; i < changedArray.Length; i++)
+            {
+                changedArray[i] = array[i + 1];
+            }
+
+            return changedArray;
+        }
+
+        Horse[] TrimNullHorses(Horse?[] horses)
+        {
+            int count = 0;
+            foreach (var horse in horses)
+            {
+                if (horse != null)
+                {
+                    count++;
+                }
+            }
+
+            Horse[] result = new Horse[count];
+            int index = 0;
+            for (var i = 0; i < horses.Length; i++)
+            {
+                var horse = horses[i];
+                if (horse != null)
+                {
+                    result[index++] = horse;
+                }
+            }
+
+            return result;
+        }
+    }
 }

HorseRace/HorseRace.cs

@@ -8,7 +8,7 @@ public sealed class HorseRace
 
     public HorseRace(Horse[] horses)
     {
-        // TODO
+        _horses = horses;
     }
 
     private bool IsFinished { get; set; }
@@ -53,7 +53,10 @@ public sealed class HorseRace
     /// </summary>
     public void PrintResults()
     {
-        // TODO
+        foreach (var horse in _horses)
+        {
+            Console.WriteLine($"{horse.Rank,3}. {horse.Name,-10} (SN {horse.StartNumber} Position {horse.Position}");
+        }
     }
 
     /// <summary>
@@ -61,7 +64,20 @@ public sealed class HorseRace
     /// </summary>
     private void MoveHorses()
     {
-        // TODO
+        if(IsFinished)
+        {
+            return;
+        }
+        
+        foreach (var horse in _horses)
+        {
+            horse.Move();
+            if (horse.Position >= MaxSteps)
+            {
+                IsFinished = true;
+                return;
+            }
+        }
     }
 
     /// <summary>
@@ -70,7 +86,10 @@ public sealed class HorseRace
     private void DrawHorses()
     {
         Console.Clear();
-        // TODO
+        foreach (var horse in _horses)
+        {
+            horse.Draw();
+        }
     }
 
     /// <summary>
@@ -79,7 +98,17 @@ public sealed class HorseRace
     private void AssignRanks()
     {
         SortByPosition();
-        // TODO
+        for (int i = 0; i < _horses.Length; i++)
+        {
+            if (i > 0 && _horses[i].Position == _horses[i - 1].Position)
+            {
+                _horses[i].Rank = _horses[i - 1].Rank;
+            }
+            else
+            {
+                _horses[i].Rank = i + 1;
+            }
+        }
     }
 
     /// <summary>
@@ -87,6 +116,15 @@ public sealed class HorseRace
     /// </summary>
     private void SortByPosition()
     {
-        // TODO
+        for (int i = 0; i < _horses.Length - 1; i++)
+        {
+            for (int j = 0; j < _horses.Length - i - 1; j++)
+            {
+                if (_horses[j].CompareTo(_horses[j + 1]) > 0)
+                {
+                    (_horses[j], _horses[j + 1]) = (_horses[j + 1], _horses[j]);
+                }
+            }
+        }
     }
 }