private String getClassName(String description) {

		int indexOfColon = getIndexOfFirstSingleColon(description);
		String firstClassName;
		if (indexOfColon == -1) {
			firstClassName = description;
		}
		else {
			firstClassName = description.substring(0, indexOfColon - 1);
		}
		firstClassName = firstClassName.replace(" ", "");

		return firstClassName;
	}
Attempts to get the parent structure from the list of class structures
@param parentName the name of the parent
@return the parent structure if there is only one with the given name, else returns null
@throws CancelledException if cancelled
Ghidra/Features/Base/ghidra_scripts/GraphClassesScript.java