How do I write this code (C++)?

/** Requires: nothing * Modifies: nothing * Effects : repeatedly prompt a user until they enter a valid pin Sample run: user input is followed by denoting the user presseing enter Please enter a pin: 123 Invalid pin. Use exactly five non-repeating digits. Please enter a pin: 11335 * Invalid pin. Use exactly five non-repeating digits. Please enter a pin: 12345 ter> * Your pin has been registered. Thank you! **/ void registerPin() { const string PIN_PROMPT = " Please enter a pin:"; const string INVALID_PROMPT = " Invalid pin. Use exactly five non-repeating digits."; cout > pin; // TODO: implement event-based loop to get valid pin // you MUST use the isValidPin() function cout