Added add, subtract, multiply and divide functions to c runtime
Added add, subtract, multiply and divide functions to c runtime

kevinmel2000/excel_to_code,kevinmel2000/excel_to_code,tamc/excel_to_code,tamc/excel_to_code,tamc/excel_to_code,dberlin/excel_to_code,tamc/excel_to_code,jmptrader/excel_to_code,jmptrader/excel_to_code,dberlin/excel_to_code