default String adjustNullableName(DefinitionKey key, String definitionName, SchemaGenerationContext generationContext) {
        return definitionName + "-nullable";
    }
Provide an alternative definition name for the given key and name when it is nullable.
<br>
By default, a {@code "-nullable"} suffix will be appended.

@param key definition reference for a type (there may be multiple different keys for the same type if custom definitions are involved)
@param definitionName previous result of {@link #getDefinitionNameForKey(DefinitionKey, SchemaGenerationContext)} to be adjusted
@param generationContext generation context providing access to the applied configuration and type context
@return adjusted definition name
jsonschema-generator/src/main/java/com/github/victools/jsonschema/generator/naming/SchemaDefinitionNamingStrategy.java