refactor: remove the throw argument for open file, and add try catch

src/ReadFile.java

@@ -10,15 +10,20 @@ public class ReadFile {
 	 * @param filename the name of the file with, only allowing a .txt extension
 	 * @return The contents of the file
 	 */
-	public List<String> open(String filename) throws IllegalArgumentException, FileNotFoundException {
+	public List<String> open(String filename) {
 		// Check that the filetype is correct, otherwise, throw IllegalArgumentException
 		if (!filename.endsWith(".txt")) {
 			throw new IllegalArgumentException("The filename is not a .txt format");
 		}
 
-		// Open the file that was defined
 		File file = new File(filename);
-		Scanner reader = new Scanner(file);
+		Scanner reader;
+		try {
+			// Open the file that was defined
+			reader = new Scanner(file);
+		} catch (FileNotFoundException e) {
+			throw new RuntimeException(e);
+		}
 
 		// List for all the separate lines on the database
 		List<String> data = new ArrayList<>();