assertEquals( "11", normalizer.normalize( " 1 1 " ) );
assertEquals( "123456789", normalizer.normalize( " 123 456 789 " ) );
assertEquals( "1", normalizer.normalize( "-1" ) );
assertEquals( "1", normalizer.normalize( "1-" ) );
assertEquals( "1", normalizer.normalize( "-1-" ) );
assertEquals( "11", normalizer.normalize( "1-1" ) );
assertEquals( "11", normalizer.normalize( "-1-1" ) );
assertEquals( "11", normalizer.normalize( "1-1-" ) );
assertEquals( "11", normalizer.normalize( "1--1" ) );
assertEquals( "11", normalizer.normalize( "-1---1-" ) );
assertEquals( "1(2)+3456789", normalizer.normalize( "---1(2)+3 456- 789 --" ) );