chore: move the go code into a subfolder

apps/api/internal/zerrors/error.go

@@ -0,0 +1,19 @@
+package zerrors
+
+import (
+	"strings"
+)
+
+// Error is a stdlib error extension.
+// It contains parameters to identify errors through all application layers
+type Error interface {
+	GetParent() error
+	GetMessage() string
+	SetMessage(string)
+	GetID() string
+}
+
+// Contains compares the error message with needle
+func Contains(err error, needle string) bool {
+	return err != nil && strings.Contains(err.Error(), needle)
+}