fixed bug where empty line would crash program

main.go

@@ -71,46 +71,51 @@ func main() {
 		}))
 
 	for _, upc := range upcs {
-		checkForNonStartingNumber := regex.MatchString(upc)
+		if len(upc) > 0 {
+			checkForNonStartingNumber := regex.MatchString(upc)
+
+			if checkForNonStartingNumber {
+				gtins = append(gtins, upc)
+				continue
+			}
+
+			if isNumeric(upc) {
+				gtins = append(gtins, upc)
+				continue
+			}
+
+			// Lower case the E
+			upc = strings.ToLower(upc)
+			// Split scientific notation at the e+ point
+			upcArray := strings.Split(upc, "e+")
+
+			fmt.Println(upcArray)
+
+			// Create separate variables for the split values
+			workingUpc := upcArray[0]
+			upcENumber := upcArray[1]
+
+			// At one to the scientific notation length to allow for the decimal point to be removed
+			upcLength, err := strconv.Atoi(upcENumber)
+			Error(err)
+			upcLength = upcLength + 1
+
+			// Remove the decimal point
+			workingUpc = strings.ReplaceAll(workingUpc, ".", "")
+
+			// Append 0 to UPC to match notation length
+			for len(workingUpc) < upcLength {
+				workingUpc = workingUpc + "0"
+			}
+
+			upc = workingUpc
 
-		if checkForNonStartingNumber {
 			gtins = append(gtins, upc)
-			continue
+			checkBar.Add(1)
+		} else {
+			gtins = append(gtins, "")
+			checkBar.Add(1)
 		}
-
-		if isNumeric(upc) == true {
-			gtins = append(gtins, upc)
-			continue
-		}
-
-		// Lower case the E
-		upc = strings.ToLower(upc)
-		// Split scientific notation at the e+ point
-		upcArray := strings.Split(upc, "e+")
-
-		fmt.Println(upcArray)
-
-		// Create separate variables for the split values
-		workingUpc := upcArray[0]
-		upcENumber := upcArray[1]
-
-		// At one to the scientific notation length to allow for the decimal point to be removed
-		upcLength, err := strconv.Atoi(upcENumber)
-		Error(err)
-		upcLength = upcLength + 1
-
-		// Remove the decimal point
-		workingUpc = strings.ReplaceAll(workingUpc, ".", "")
-
-		// Append 0 to UPC to match notation length
-		for len(workingUpc) < upcLength {
-			workingUpc = workingUpc + "0"
-		}
-
-		upc = workingUpc
-
-		gtins = append(gtins, upc)
-		checkBar.Add(1)
 	}
 
 	answerBar := progressbar.NewOptions(len(gtins),