Unpredictable string program
Merge branch 'master' of github.com:atul9/rubylearning56

Merging master branch as 1_week/2c is not updated.
Merge branch 'master' of github.com:atul9/rubylearning56

Added methods to the 1_week/2c
Merge branch 'master' of github.com:atul9/rubylearning56

Merged 1_week/2c_challenge_convert.rb
Added Rankine method