Removed uneccessary suffixes

catalog/entity/product.go

@@ -2,7 +2,7 @@ package catalog
 
 import "github.com/jackc/pgtype"
 
-type ProductEntity struct {
+type Product struct {
 	ID        int              `db:"id"`
 	PID       string           `db:"pid"`
 	Name      string           `db:"name"`

catalog/model/product.go

@@ -4,7 +4,7 @@ import (
 	"time"
 )
 
-type ProductModel struct {
+type Product struct {
 	PID       string    `db:"pid"`
 	Name      string    `db:"name"`
 	Price     float64   `db:"price"`