Continued work on changeAccountName() & basic refactoring

libs/AtmAdmin.h

@@ -8,6 +8,7 @@ namespace AtmAdmin {
     char startup();
     bool handleUserInformation(char choice, std::string& information);
     std::string changeAccountPin();
+    std::string changeAccountName();
 }
 
 #endif //ATMADMIN_H

src/AtmAdmin.cpp

@@ -1,9 +1,9 @@
-#include <iostream>
-#include "Errorseal.h"
-#include "AtmAdmin.h"
-
 #include <algorithm>
-#include <oneapi/tbb/detail/_task.h>
+#include <iostream>
+#include <ranges>
+
+#include "AtmAdmin.h"
+#include "Errorseal.h"
 
 namespace AtmAdmin {
     char startup() {
@@ -36,8 +36,11 @@ namespace AtmAdmin {
                 // Ensure that the name is also converted to fully lowercase.
 
                 // The code below is a placeholder
-                std::cout << "Enter your new username: ";
+                tempInformation = changeAccountName();
-                std::cin >> information;
+                if (tempInformation != "invalid") {
+                    information = tempInformation;
+                    return true;
+                }
                 break;
             case '3':
                 // Simply a way to cheat, very straight-forward.
@@ -108,14 +111,25 @@ namespace AtmAdmin {
     std::string changeAccountName() {
         std::string newName{};
 
+
         std::cout << "Enter new name: ";
         std::cin >> newName;
         Error::ignoreLine();
 
-        if (newName.size() < 2 or newName.size() > 10) {
+        // Ensures the name is between 2 and 10 characters long.
+        if (newName.length() < 2 or newName.length() > 10) {
             errorReport("Name has to be between 2 and 10 characters.");
             return "invalid";
         }
+
+        // Checks if the first character is a number.
+        if (isdigit(newName.at(0))) {
+            errorReport("First letter cannot be a digit.");
+            return "invalid";
+        }
+
+        // Turns all the letters into lowercase.
+        std::ranges::transform (newName.cbegin(), newName.cend(), newName.begin(), [] (unsigned char input) { return tolower(input); });
         return newName;
     }
 }