Change string_to_lower, to_upper and bug fix
treeb6033108057ad0d72c07aa4fd24b70e6365f940c
-rw-r--r-- 741 .gitignore
-rw-r--r-- 55 README.md
-rw-r--r-- 85 libstring.pro
drwxr-xr-x - src
drwxr-xr-x - test