- hashPassword can now be used as a standalone method

src/Entity/User.php

@@ -85,7 +85,7 @@ class User {
 
     public function __toString() : string
     {
-        return $this->fullname();
+        return "{$this->firstName} {$this->lastName}";
     }
 
     public function setPassword($password) : self
@@ -95,9 +95,9 @@ class User {
         return $this->hashPassword();
     }
 
-    public function hashPassword() : self
+    public function hashPassword(? string $password = null) : self
     {
-        $this->password = password_hash($this->password, PASSWORD_DEFAULT);
+        $this->password = password_hash($password ?: $this->password, PASSWORD_DEFAULT);
 
         return $this;
     }