chore: showcase more string manipulation in addressbook example

.idea/runConfigurations/Styve.xml

@@ -2,7 +2,7 @@
   <configuration default="false" name="Styve" type="Application" factoryName="Application" nameIsGenerated="true">
     <option name="MAIN_CLASS_NAME" value="Styve" />
     <module name="styve" />
-    <option name="PROGRAM_PARAMETERS" value="program_example.styve -ni" />
+    <option name="PROGRAM_PARAMETERS" value="examples/program_example.styve -ni" />
     <method v="2">
       <option name="Make" enabled="true" />
     </method>

program_example.styve → examples/program_example.styve

@@ -54,6 +54,7 @@ Arne Arne Styve AddressBook Arne 8=
 =D
 
 Arne Arne Styve Arne Arne formatPhone(phoneNumber) 8=
+    phoneNumber Arne phoneNumber Arne Styve erstattAlt(" ", "") Styve
     Arne? (phoneNumber Arne Styve starterMed("+")) 8=
         phoneNumber Arne phoneNumber Arne Styve hentUtDel(1) Styve
     =D Styve