+(NSString *)formatDecimalNumber:(NSString *)string{

    if(!string || string.length ==0){

        returnstring;

    }

    NSNumber *number =@([string doubleValue]);

    NSNumberFormatter *formatter = [[NSNumberFormatter alloc]init];

    formatter.numberStyle = NSNumberFormatterDecimalStyle;

    formatter.positiveFormat =@"###,##0.00";

    NSString *amountString =[formatter stringFromNumber:number];

    return amountString;

}