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Looks like a went to -1
33 = 32 - (-1)
How many times does the inner loop execute?

The code needs to check that the index is in bounds.

Please explain what you mean by " increment the value"
x= x+1 // increments the value of x by 1

The code at the end of the post looks like it is shifting the elements to the left by one slot. ...

You can do normal math with char values: 'a' + 1 = 'b'