Project Description:
Write a small utility that:
1 let user pick existing Excel file or specify it in the command line
2 read Excel and write plain text file
See attached Excel file for input sample
Text file should be in the format of
ES,1550,Green
ES,1146.5,Green
...
ES,1420,Orange
....
CL,90,Green
....
Excel can have empty row/column/cell, those should be ignored
Excel can have variable number of column to export
