Initial pre-release v0.1.0-alpha

Calculator api in rust. Takes a String-term and calculates the result. Currently supported Operands:

• addition (+)
• subtraction (-)
• multiplication (*)
• division (/)
• modulo (%)

As well as Parenthesis with the normal round ones () but also the square brackets [].
It is basically an Implementation of the Shunting Yard Algorithm by the goat Edsger W. Dijkstra

the standard function is
fn eval(expression: &String) -> Result<u32, String>
which takes a String and returns the result as a Result<u32, String>
If you want a bit verbosity then there is:
fn verbose_eval(expression: &String, verbosity: u8) -> Result<u32, String>
which also takes a value between 1 and 4 that determinate the amount of logging it does

• 1 prints the shunting yard output stack and all of the above.
• 2 prints the operator stack of shunting yard and all of the above.
• 3 prints the stack of the solver and all of the above
• 4 prints the expression stack of the function that turns the string into a stack and all of the above

Did not check for any typing and grammar errors