Added findProfessorById Method to Administration Class

src/main/java/org/example/Administration.java

@@ -49,6 +49,18 @@ public class Administration {
         admins.add(admin);
     }
 
+    public Professor findProfessorById(String professorId)
+    {
+        for(Professor professor :professors)
+        {
+            if(professor.getProfessorID().equals(professorId))
+            {
+                return professor;
+            }
+        }
+
+        return null;
+    }