支持重复字母

1#test_word_info.rb
2
3require_relative 'word_info'
4
5puts word_info('palladium', ['p'])
6puts word_info('palladium', ['p', 'l'])
7puts word_info('palladium', ['p', 'l', 'a'])

1root@educative:/usercode# ruby hangman.rb
2P _ _ _ _ _ _ _ _ 
3P _ L _ _ _ _ _ _ 
4P A L _ _ _ _ _ _ 

1# letters 应当是给定单词中的一部分，并且为小写
2def word_info word, letters
3
4    n = word.length
5    underscores = "_ " * n
6
7    letters.each do |letter|
8        i = word.index(letter)
9        underscores[2 * i] = letter.upcase
10    end
11
12    underscores
13    
14end

1root@educative:/usercode# ruby hangman.rb
2P _ _ _ _ _ _ _ _ 
3P _ L L _ _ _ _ _ 
4P A L L A _ _ _ _