phone-number: rename ToString to Formatted
phone-number: rename ToString to Formatted

ToString is a method of ancestor class TObject.  Each student can override the method with there own, but overridding ancestor methods isn't really the scope of this exercise, and this particular case is bonus.
rpottsoh/exercism-delphi,exercism/xpascal,rpottsoh/xpascal,rpottsoh/xdelphi,exercism/xdelphi