fixed bug where real numbers crashed app

answer.txt

@@ -0,0 +1,46 @@
+UPC
+200033148770
+200042041350
+200042041400
+200042064910
+200047796200
+200059594110
+200059660970
+200065290180
+200065290220
+200065290310
+200065290340
+200065290370
+200066707320
+200069556670
+200072791220
+0075849385857
+200072791320
+200072791380
+200072791470
+200072950140
+200079186270
+200079343740
+200081451640
+200081630310
+200106953220
+200156488680
+200157056340
+200168095820
+200168979440
+200172490020
+200177334550
+200177780700
+200177788230
+327582805540
+337582889920
+357582840140
+357582843530
+357582850030
+477039522210
+477039522200
+482000077030
+482000077040
+482000077090
+647582802920
+647582804700

examplelist.txt

@@ -14,32 +14,33 @@ UPC
 2.0006670732e+11
 2.0006955667e+11
 2.0007279122e+11
+0075849385857
 2.0007279132e+11
-2.0007279138e+11
-2.0007279147e+11
-2.0007295014e+11
-2.0007918627e+11
-2.0007934374e+11
-2.0008145164e+11
-2.0008163031e+11
-2.0010695322e+11
-2.0015648868e+11
-2.0015705634e+11
-2.0016809582e+11
-2.0016897944e+11
-2.0017249002e+11
-2.0017733455e+11
-2.001777807e+11
-2.0017778823e+11
-3.2758280554e+11
-3.3758288992e+11
-3.5758284014e+11
-3.5758284353e+11
-3.5758285003e+11
-4.7703952221e+11
-4.770395222e+11
-4.8200007703e+11
-4.8200007704e+11
-4.8200007709e+11
-6.4758280292e+11
-6.475828047e+11
+2.0007279138E+11
+2.0007279147E+11
+2.0007295014E+11
+2.0007918627E+11
+2.0007934374E+11
+2.0008145164E+11
+2.0008163031E+11
+2.0010695322E+11
+2.0015648868E+11
+2.0015705634E+11
+2.0016809582E+11
+2.0016897944E+11
+2.0017249002E+11
+2.0017733455E+11
+2.001777807E+11
+2.0017778823E+11
+3.2758280554E+11
+3.3758288992E+11
+3.5758284014E+11
+3.5758284353E+11
+3.5758285003E+11
+4.7703952221E+11
+4.770395222E+11
+4.8200007703E+11
+4.8200007704E+11
+4.8200007709E+11
+6.4758280292E+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

@@ -78,6 +78,13 @@ func main() {
 			continue
 		}
 
+		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+")