Add format option to ignore the separator

Author: Maximilian Pfundstein

Personnummer.Tests/PersonnummerTests.cs

@@ -268,6 +268,27 @@ public void TestSeparator(PersonnummerData ssn)
             Assert.Equal(sep, Personnummer.Parse(ssn.SeparatedFormat, new Personnummer.Options { AllowCoordinationNumber = true }).Separator);
             // Getting the separator from a short formatted none-separated person number is not actually possible if it is intended to be a +.
         }
+        
+        [Theory]
+        [ClassData(typeof(ValidSsnDataProvider))]
+        [ClassData(typeof(ValidCnDataProvider))]
+        public void TestIgnoreSeparatorWhenFormatting(PersonnummerData ssn)
+        {
+            var separators = "+-".ToCharArray();
+            
+            var ps1 = Personnummer.Parse(ssn.LongFormat, new Personnummer.Options { AllowCoordinationNumber = true });
+            var ps2 = Personnummer.Parse(ssn.SeparatedLong, new Personnummer.Options { AllowCoordinationNumber = true });
+            var ps3 = Personnummer.Parse(ssn.SeparatedFormat,
+                new Personnummer.Options { AllowCoordinationNumber = true });
+            
+            Assert.True(ps1.Format(false, true).IndexOfAny(separators) == -1);
+            Assert.True(ps2.Format(false, true).IndexOfAny(separators) == -1);
+            Assert.True(ps3.Format(false, true).IndexOfAny(separators) == -1);
+            
+            Assert.True(ps1.Format().IndexOfAny(separators) >= 0);
+            Assert.True(ps2.Format().IndexOfAny(separators) >= 0);
+            Assert.True(ps3.Format().IndexOfAny(separators) >= 0);
+        }
 
         [Theory]
         [ClassData(typeof(OrgNumberDataProvider))]

Personnummer/Personnummer.cs

@@ -126,10 +126,11 @@ public Personnummer(string ssn, Options? options = null)
         /// If longFormat is true, it will include the century (YYYYMMDD-/+XXXX)
         /// </summary>
         /// <param name="longFormat">If century should be included.</param>
+        /// <param name="ignoreSeparator">Whether the separator should be ignored.</param>
         /// <returns>Formatted personal identity number.</returns>
-        public string Format(bool longFormat = false)
+        public string Format(bool longFormat = false, bool ignoreSeparator = false)
         {
-            return $"{(longFormat ? FullYear : Year)}{Month}{Day}{Separator}{Numbers}";
+            return ignoreSeparator ? $"{(longFormat ? FullYear : Year)}{Month}{Day}{Numbers}" : $"{(longFormat ? FullYear : Year)}{Month}{Day}{Separator}{Numbers}";
         }
 
         /// <summary>