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→IO_Label
This constructor will create an empty (blank) IO_Label with capacity of len characters.
In this case '''row''' and '''col''' are passed to the parent for initialisation and '''_len''' (the atterbuteattribute) is set to the incoming argument '''len'''.
Then IO_Field::_data will be set to the address of a newly allocated memory to the size of '''_len + 1 ''' bytes which also will be set to an empty string.
