Removes and returns the character at the specified position.
- Xcode 8.0+
The position of the character to remove.
imust be a valid index of the string that is not equal to the string’s end index.
The character that was removed.
All the elements following
i are moved to close the gap. This example removes the hyphen from the middle of a string.
Calling this method invalidates any existing indices for use with this string.