Jiao:add .gitignore file
Jiao: init framework
Jiao: add description for practise
Jiao: list tasking
Jiao: when input 'hmm' and return 'hmm'
Jiao: when input vowel, then return 'mommy'
Jiao: fix an error and refactore code
Jiao:when vowel is more than 30%, then replace with 'mommy'
Jiao:only replace once when more than two vowel together