public PPToken remove(String string) {
		PPToken token = defs.remove(string);
		Hashtable findTable = lookupTable;
		Character chObj = null;

		int pos = 0;
		int len = string.length();
		while (pos < len) {
			char ch = string.charAt(pos++);
			chObj = Character.valueOf(ch);

			findTable = (Hashtable) findTable.get(chObj);

			if (findTable == null) {
				return token;
			}
		}

		findTable.remove(VALUE);

		return token;
	}
Remove a definition from the known defines.

@param string name of define
@return return the defined token for the named define.
Ghidra/Features/Base/src/main/java/ghidra/app/util/cparser/CPP/DefineTable.java