A quick-fix to rename such packages is available only in the editor.
Example:
package io;
This example will be reported if the inspection is enabled with the default settings where a package name should have a minimum length of 3.
Use the fields in the Options section to specify the minimum length, maximum length, and regular expression for
acceptable package names.
Specify 0 in a length field to skip the corresponding check.
Regular expressions use the standard java.util.regex format.