Forgot a function.

flags/printUsage.go

@@ -6,19 +6,6 @@ import (
 	"os"
 )
 
-// Validate if the char provided is 0-9
-func (flags *Flags) validChar(char rune) (valid bool) {
-	decvals := [10]int{48, 49, 50, 51, 52, 53, 54, 55, 56, 57}
-
-	for _, value := range decvals {
-		if char == rune(value) {
-			valid = true
-		}
-	}
-
-	return
-}
-
 // Print help information for the end-user
 func (flags *Flags) printUsage() {
 	fmt.Fprintf(flag.CommandLine.Output(), "Usage of %s:\n", os.Args[0])

flags/validChar.go

@@ -0,0 +1,14 @@
+package flags
+
+// Validate if the char provided is 0-9
+func (flags *Flags) validChar(char rune) (valid bool) {
+	decvals := [10]int{48, 49, 50, 51, 52, 53, 54, 55, 56, 57}
+
+	for _, value := range decvals {
+		if char == rune(value) {
+			valid = true
+		}
+	}
+
+	return
+}