String Calculator

======How to Use======
1. Input strings to be calculated:
Click String A to input the string to be processed, which can be one or many lines of data. Click "confirm" and "String A" will be displayed on the calculator screen, indicating that the data is ready for the next calculation.
2. Design calculation formula:
*If it is only for the calculation of String A, you may click the light gray calculation button, such as uppercase, lowercase, de duplicate, etc. The calculator screen will display orange "String A - > upper - > and other contents, which indicates that the operation formula is ready for the next operation.
*If it is for String A to be associated with another String B, you may click the dark gray calculation button, such as Left insert, Top insert, Remove, etc.
3. Results:
Click the equal button, and the calculator will immediately perform the calculation and display the result.
4. If the data needs to be processed multiple times, multiple operations can be performed at the same time.
*For example of 1. You want to remove the duplicate content from a batch of data, and finally display it in all uppercase formats in reverse order. You may click the String A in turn, Remove same, Upper, Des order, and Equal to get the result you want.
*For example of 2. You want to remove some data contained in a batch of data, and insert a new batch of data after removing the data. At last, you want to add another batch of data to the left side of these data by lines. You may click String A in turn, Remove B,Bottom insert, Left insert, and Equal to get the result you want.
*It should be noted that it is necessary to make sure that the orange calculation formula in the calculator screen is input correctly, and then click the equal button, otherwise it cannot be calculated or the calculation will be wrong.
======Thank you======
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