Break utils package into subpackages.

internal/utils/dbidentifier/dbidentifier.go

@@ -0,0 +1,24 @@
+package dbidentifier
+
+import (
+	"github.com/go-jet/jet/v2/internal/3rdparty/snaker"
+	"strings"
+)
+
+// ToGoIdentifier converts database identifier to Go identifier.
+func ToGoIdentifier(databaseIdentifier string) string {
+	return snaker.SnakeToCamel(replaceInvalidChars(databaseIdentifier))
+}
+
+// ToGoFileName converts database identifier to Go file name.
+func ToGoFileName(databaseIdentifier string) string {
+	return strings.ToLower(replaceInvalidChars(databaseIdentifier))
+}
+
+func replaceInvalidChars(str string) string {
+	str = strings.Replace(str, " ", "_", -1)
+	str = strings.Replace(str, "-", "_", -1)
+	str = strings.Replace(str, ".", "_", -1)
+
+	return str
+}