bugfixes sort function

src/app/components/contacts/contacts.component.html

@@ -10,7 +10,7 @@
       </div>
     </button>
     <div class="content">
-      @for (sortLetter of this.checkUsersFirstLetter(); track sortLetter) {
+      @for (sortLetter of this.sortFirstLetter(); track sortLetter) {
       <div class="first-letter">{{ sortLetter }}</div>
       <div class="line"></div>
       @for (user of this.sortUsersByFirstLetter(sortLetter); track user; let

src/app/components/contacts/contacts.component.ts

@@ -55,13 +55,12 @@ export class ContactsComponent {
     );
   }
 
-  checkUsersFirstLetter() {
+  sortFirstLetter() {
+    let filteretArray = this.loadAllUserWithoutGuest().sort((a, b) =>
+      a.firstName.localeCompare(b.firstName)
+    );
     let usersFirstLetter = Array.from(
-      new Set(
-        this.loadAllUserWithoutGuest().map((user) =>
-          user.firstName[0].toUpperCase()
-        )
-      )
+      new Set(filteretArray.map((user) => user.firstName[0].toUpperCase()))
     );
     return usersFirstLetter;
   }