Parsing String

[AhmedSadek60]

Program should be able to parse string correctly Parsing string means:

• what type of line is that : definition of matrix or operation of matrices ? ( defining a variable and calculating its value will be handled in another task by others)

• Execute the code after determining its type

• Program should detect that there is matrix inside matrix and exclude the inner matrix to be ready to use it later ( you only need to make the inner matrix ready and defined as matrix or put in vector or string. Others will use it and merge it with the big matrix)

[mohamedelshorbagy]

I finish the task and Pushed in last commit with other problems like Prefix Expression and Prefix Evaluation