Merge pull request #1 from x-zh/master

add introduction of Charlie X.
mission 2

add mission 2
Merge pull request #2 from alexjinyao/master

mission 2 of alexjin
Merge pull request #3 from x-zh/master

change folder structure
add m34
Merge pull request #4 from x-zh/master

add mission 2 of xin
add mission2 readme
Merge branch 'master' of github.com:TechPuppies/NoBugAlg
Merge remote-tracking branch 'upstream/master'