better hierarchy and better way to make a CRUD

models/errors.go

@@ -0,0 +1,8 @@
+package models
+
+import "errors"
+
+var (
+	// ErrNotFound ...
+	ErrNotFound = errors.New("requested item is not found")
+)

models/post.go

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+package models
+
+// Post ...
+type Post struct {
+	ID      int    `json:"id"`
+	Title   string `json:"title"`
+	Content string `json:"content"`
+}