added zip to gitignore

.gitignore

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

examplelist.txt

@@ -14,32 +14,33 @@ UPC
 2.0006670732e+11
 2.0006955667e+11
 2.0007279122e+11
+0075849385857
 2.0007279132e+11
-2.0007279138e+11
+2.0007279138E+11
-2.0007279147e+11
+2.0007279147E+11
-2.0007295014e+11
+2.0007295014E+11
-2.0007918627e+11
+2.0007918627E+11
-2.0007934374e+11
+2.0007934374E+11
-2.0008145164e+11
+2.0008145164E+11
-2.0008163031e+11
+2.0008163031E+11
-2.0010695322e+11
+2.0010695322E+11
-2.0015648868e+11
+2.0015648868E+11
-2.0015705634e+11
+2.0015705634E+11
-2.0016809582e+11
+2.0016809582E+11
-2.0016897944e+11
+2.0016897944E+11
-2.0017249002e+11
+2.0017249002E+11
-2.0017733455e+11
+2.0017733455E+11
-2.001777807e+11
+2.001777807E+11
-2.0017778823e+11
+2.0017778823E+11
-3.2758280554e+11
+3.2758280554E+11
-3.3758288992e+11
+3.3758288992E+11
-3.5758284014e+11
+3.5758284014E+11
-3.5758284353e+11
+3.5758284353E+11
-3.5758285003e+11
+3.5758285003E+11
-4.7703952221e+11
+4.7703952221E+11
-4.770395222e+11
+4.770395222E+11
-4.8200007703e+11
+4.8200007703E+11
-4.8200007704e+11
+4.8200007704E+11
-4.8200007709e+11
+4.8200007709E+11
-6.4758280292e+11
+6.4758280292E+11
-6.475828047e+11
+6.475828047E+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 +79,13 @@ 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
 			upcArray := strings.Split(upc, "e+")
 
@@ -104,6 +112,10 @@ func main() {
 
 			gtins = append(gtins, upc)
 			checkBar.Add(1)
+		} else {
+			gtins = append(gtins, "")
+			checkBar.Add(1)
+		}
 	}
 
 	answerBar := progressbar.NewOptions(len(gtins),