public static void main ( String [ ] args ) {
  String str = "helloworld" ;
  System . out . println ( "Original String: " + str ) ;
  String res = duplicateVowels ( str ) ;
  System . out . println ( "String with Vowels duplicated: " + res ) ;
}

public static void main ( String [ ] args ) { String str = " helloworld " ; System . out . println ( " Original ▁ String : ▁ " + str ) ; String res = duplicateVowels ( str ) ; System . out . println ( " String ▁ with ▁ Vowels ▁ duplicated : ▁ " + res ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (string_literal))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (string_literal) right: (identifier))))) (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation name: (identifier) arguments: (argument_list (identifier))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (string_literal) right: (identifier)))))))