Javascript function to handle with objects at the same tipe non ordered in an array
this functions works if you have a array with this structure
['black-PP', 'black-M', 'black-G', 'black-GG', 'black-GG', 'white-PP', 'white-G', 'red-M', 'blue-XG', 'blue-XG', 'blue-XG', 'blue-P']