Constructor -initialize this class into an empty class?

Lets say I have class TheClass. In the constructor, how do I initialize this TheClass to be an empty TheClass?
Define "empty".
Well i'm buiilding a custom string class (Called MyString) for a school course, and in the constructor we are told to "initialize this MyString to an empty MyString" But i'm not sure what that meaneth.
You can using a char array "myString" to store string.
if myString[0] is '\0', this is a empty string.
But at beginning you should give a definite number "n" to initialize "myString". And please be aware of "myString" can only contain n-1 character.
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