Removed spaces from top-level directory names.

Spaces tend to cause annoyances in a Unix-style shell environment.
This change fixes that.

54_Letter/java/README.md

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+Original source downloaded [from Vintage Basic](http://www.vintage-basic.net/games.html)
+
+Conversion to [Oracle Java](https://openjdk.java.net/)

54_Letter/java/src/Letter.java

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+import java.awt.*;
+import java.util.Arrays;
+import java.util.Scanner;
+
+/**
+ * Game of Letter
+ * <p>
+ * Based on the Basic game of Letter here
+ * https://github.com/coding-horror/basic-computer-games/blob/main/54%20Letter/letter.bas
+ * <p>
+ * Note:  The idea was to create a version of the 1970's Basic game in Java, without introducing
+ * new features - no additional text, error checking, etc has been added.
+ */
+public class Letter {
+
+    public static final int OPTIMAL_GUESSES = 5;
+    public static final int ASCII_A = 65;
+    public static final int ALL_LETTERS = 26;
+
+    private enum GAME_STATE {
+        STARTUP,
+        INIT,
+        GUESSING,
+        RESULTS,
+        GAME_OVER
+    }
+
+    // Used for keyboard input
+    private final Scanner kbScanner;
+
+    // Current game state
+    private GAME_STATE gameState;
+
+    // Players guess count;
+    private int playerGuesses;
+
+    // Computers ascii code for a random letter between A..Z
+    private int computersLetter;
+
+    public Letter() {
+
+        gameState = GAME_STATE.STARTUP;
+
+        // Initialise kb scanner
+        kbScanner = new Scanner(System.in);
+    }
+
+    /**
+     * Main game loop
+     */
+    public void play() {
+
+        do {
+            switch (gameState) {
+
+                // Show an introduction the first time the game is played.
+                case STARTUP:
+                    intro();
+                    gameState = GAME_STATE.INIT;
+                    break;
+
+                case INIT:
+                    playerGuesses = 0;
+                    computersLetter = ASCII_A + (int) (Math.random() * ALL_LETTERS);
+                    System.out.println("O.K., I HAVE A LETTER.  START GUESSING.");
+                    gameState = GAME_STATE.GUESSING;
+                    break;
+
+                // Player guesses the number until they get it or run out of guesses
+                case GUESSING:
+                    String playerGuess = displayTextAndGetInput("WHAT IS YOUR GUESS? ").toUpperCase();
+
+                    // Convert first character of input string to ascii
+                    int toAscii = playerGuess.charAt(0);
+                    playerGuesses++;
+                    if (toAscii == computersLetter) {
+                        gameState = GAME_STATE.RESULTS;
+                        break;
+                    }
+
+                    if (toAscii > computersLetter) {
+                        System.out.println("TOO HIGH.  TRY A LOWER LETTER.");
+                    } else {
+                        System.out.println("TOO LOW.  TRY A HIGHER LETTER.");
+                    }
+                    break;
+
+                // Play again, or exit game?
+                case RESULTS:
+                    System.out.println();
+                    System.out.println("YOU GOT IT IN " + playerGuesses + " GUESSES!!");
+                    if (playerGuesses <= OPTIMAL_GUESSES) {
+                        System.out.println("GOOD JOB !!!!!");
+                        // Original game beeped 15 tims if you guessed in the optimal guesses or less
+                        // Changed this to do a single beep only
+                        Toolkit.getDefaultToolkit().beep();
+                    } else {
+                        // Took more than optimal number of guesses
+                        System.out.println("BUT IT SHOULDN'T TAKE MORE THAN " + OPTIMAL_GUESSES + " GUESSES!");
+                    }
+                    System.out.println();
+                    System.out.println("LET'S PLAN AGAIN.....");
+                    gameState = GAME_STATE.INIT;
+                    break;
+            }
+        } while (gameState != GAME_STATE.GAME_OVER);
+    }
+
+    public void intro() {
+        System.out.println(simulateTabs(33) + "LETTER");
+        System.out.println(simulateTabs(15) + "CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY");
+        System.out.println();
+        System.out.println("LETTER GUESSING GAME");
+        System.out.println();
+        System.out.println("I'LL THINK OF A LETTER OF THE ALPHABET, A TO Z.");
+        System.out.println("TRY TO GUESS MY LETTER AND I'LL GIVE YOU CLUES");
+        System.out.println("AS TO HOW CLOSE YOU'RE GETTING TO MY LETTER.");
+    }
+
+    /**
+     * Simulate the old basic tab(xx) command which indented text by xx spaces.
+     *
+     * @param spaces number of spaces required
+     * @return String with number of spaces
+     */
+    private String simulateTabs(int spaces) {
+        char[] spacesTemp = new char[spaces];
+        Arrays.fill(spacesTemp, ' ');
+        return new String(spacesTemp);
+    }
+
+    /*
+     * Print a message on the screen, then accept input from Keyboard.
+     *
+     * @param text message to be displayed on screen.
+     * @return what was typed by the player.
+     */
+    private String displayTextAndGetInput(String text) {
+        System.out.print(text);
+        return kbScanner.next();
+    }
+}

54_Letter/java/src/LetterGame.java

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+public class LetterGame {
+
+    public static void main(String[] args) {
+
+        Letter letter = new Letter();
+        letter.play();
+    }
+}