feat: adding the method demote / promote

cpp05/ex00/Bureaucrat.cpp

@@ -81,6 +81,27 @@ std::string Bureaucrat::getName() const {
 	return (this->_name);
 }
 
+/**
+ * @brief Get a promotion for the Bureaucrat
+ */
+void Bureaucrat::promote() {
+	if (this->_grade == 1) {
+		throw GradeTooHighException();
+	} else {
+		--this->_grade;
+	}
+}
+
+/**
+ * @brief Get a demotion for the Bureaucrat
+ */
+void Bureaucrat::demote() {
+	if (this->_grade == 150) {
+		throw GradeTooLowException();
+	} else {
+		++this->_grade;
+	}
+}
 /**
  * @brief Overload of the '<<' operator to print
  *