Write bash script that rotate logs.

Do the following:

- create a log directory. The directory is an argument to routate the file names

- file names in the format .number.log

- if NOT vaild - input parameters such as no inputs, negative number, not a directory and non writable directory. Provide feedback to the user and end the program

- if IS VAILD - Rename all files with name (e.g. -3 will rename all files to .3.log). Delete all files with number higher than 5