completed stages 2-5 of about_strings

* learned all about single and double quoted string
* learned how to use backslashes to use a quote inside a string

[#75411412]
completed stages 6-10  of about_strings

* learned many different way to define strings
* flexible strings: %{string here}
* %(string goes here) or
* %!string goes here!
* also learned about heredocs and string concatenation

[#75411412]
completed stages 11-16 of about_strings

* learned about the += and the << (shovel) operators
* += will leave original string unchanged
* << will change the original string
* learned that escape characters work as such in double quoted string
* escape characters are stricly characters in a single quoted string

[#75411412]
completed stages 17-21 of about_strings

* learned that single quotes interpret excape characters when escapingg \
* or '
* learned that double quotes work with string interpolation "#{}"
* single quotes do not work with string interpolation
* learned that you can do any ruby operations in string interpolation

[#75411412]
completed stages 22-27 of about_strings

* learned how to access a single character in a string
* learned about ruby v 1.8 vs 1.9 character representation
* older versions of ruby represent characters as integers
* newer versions of ruby represent characters as strings
* learned about splitting strings and joining arrays

[#75411412]