Implemented the functions

DigitSequence/Digits.cs

@@ -4,18 +4,44 @@ namespace DigitSequence;
 
 public sealed class Digits(int number) : IEnumerable<int>, IComparable<Digits>
 {
-    // TODO
-    //private readonly int _number;
+    private readonly int _number = Math.Abs(number);
 
+    /// <summary>
+    /// Compares to another digit
+    /// </summary>
+    /// <param name="other">The other digit</param>
+    /// <returns>The default compared value</returns>
     public int CompareTo(Digits? other)
     {
-        // TODO
-        return -1;
+        if (other == null)
+        {
+            return 1;
+        }
+
+        if (ReferenceEquals(this, other))
+        {
+            return 0;
+        }
+        
+        return _number.CompareTo(other._number);
     }
 
-    public IEnumerator<int> GetEnumerator() => null!; // TODO
+    /// <summary>
+    /// Gets the enumerator of type <see cref="int"/>
+    /// </summary>
+    /// <returns>The <see cref="IEnumerator"/> of type <see cref="int"/></returns>
+    public IEnumerator<int> GetEnumerator() => new DigitEnumerator(number);
 
-    IEnumerator IEnumerable.GetEnumerator() => null!; // TODO
+    /// <summary>
+    /// Gets the enumerator as an <see cref="object"/> of type <see cref="IEnumerator"/>
+    /// </summary>
+    /// <returns>The <see cref="IEnumerator"/></returns>
+    // I'm gonna be a wikipedia author with that many references xD
+    IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
 
-    public override string ToString() => null!; // TODO
-}
+    /// <summary>
+    /// The overriden Method to get the <see cref="string"/> representation of the current object
+    /// </summary>
+    /// <returns>The values of <see cref="Digits"/> in a <see cref="string"/> format</returns>
+    public override string ToString() => _number.ToString();
+}