Deallocating member pointer

#include <iostream>

using namespace std;


class myClass{

public:
    char * pointer;
    char * pointerToPointer;

myClass(){
  pointer = new char;
      char x = 'x';
      pointer = &x;

  pointerToPointer = new char[3];
      char y[3] = {'x', 'y', 'z'};
      pointerToPointer = y;
}
~myClass(){
  delete pointer;
  delete[] pointerToPointer;
}};

int main(){
myClass myclass;
return 0;
}

I am new to c++, so I apologize if this question has been beaten to death, but I couldn't seem to find an answer online.

I am trying to include two pointers in my class. One that points to a single letter, and the other that points to an array of chars. From what i understand every time the new keyword is included it should be accompanied by the delete keyword at some point in the code.

I have included a destructor that should deallocate the memory allocated to these pointers, but when it is called in the main function upon the program termination i am left with:

Error in `./a.out': munmap_chunk(): invalid pointer: 0x00007fffcabc5600 *** Aborted (core dumped)

Any advice / suggestions on what i should be googling would be greatly appreciated.