public StringDataInstance getCharOffcut(int offsetChars) {
		return getByteOffcut(getCharOffset(offsetChars));
	}
Create a new {@link StringDataInstance} that points to a portion of this instance, starting
at a character offset (whereever that may be) into the data.

@param offsetChars number of characters from the beginning of the string to start the new
           StringDataInstance.
@return new {@link StringDataInstance} pointing to a subset of characters, or the
        <code>this</code> instance if there was an error.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/data/StringDataInstance.java