added zip to gitignore

.gitignore

@@ -8,6 +8,7 @@
 *.dll
 *.so
 *.dylib
+*.zip
 
 # Test binary, built with `go test -c`
 *.test

examplelist.txt

@@ -14,6 +14,7 @@ UPC
 2.0006670732e+11
 2.0006955667e+11
 2.0007279122e+11
+0075849385857
 2.0007279132e+11
 2.0007279138E+11
 2.0007279147E+11

isNumeric.go

@@ -0,0 +1,10 @@
+package main
+
+import (
+	"regexp"
+)
+
+func isNumeric(s string) bool {
+	match, _ := regexp.MatchString("^[0-9]+$", s)
+	return match
+}

main.go

@@ -71,6 +71,7 @@ func main() {
 		}))
 
 	for _, upc := range upcs {
+		if len(upc) > 0 {
 			checkForNonStartingNumber := regex.MatchString(upc)
 
 			if checkForNonStartingNumber {
@@ -78,6 +79,11 @@ func main() {
 				continue
 			}
 
+			if isNumeric(upc) {
+				gtins = append(gtins, upc)
+				continue
+			}
+
 			// Lower case the E
 			upc = strings.ToLower(upc)
 			// Split scientific notation at the e+ point
@@ -106,6 +112,10 @@ func main() {
 
 			gtins = append(gtins, upc)
 			checkBar.Add(1)
+		} else {
+			gtins = append(gtins, "")
+			checkBar.Add(1)
+		}
 	}
 
 	answerBar := progressbar.NewOptions(len(gtins),