Please provide code for all the fix me tasks. many thanks public class Q4Cypher { /**  * Constructor for a cypher instance  * @param key The key used by the cypher  */  public Q4Cypher(int key) { // FIXME Question 4b: complete this constructor  } /**  * Determine whether the input string is well-formed according to the following rules:  * - it must not be null  * - it must not be empty  * - it must only contain the characters in the character range ' ' to 'Z' (values 32 to 90 inclusive).  * - it must not start or end with a space  * @param input The string to be checked  * @return True if the input string is well-formed  */  static boolean isWellFormed(String input) { return false; // FIXME Question 4a: complete this function  } /**  * Encode the input string using a simple rotation cypher.  *  * For a character c at position i in the string, it is shifted i + key places  * in the sequence of 59 characters ' ' ... 'Z', where a shift beyond 'Z'  * wraps around to the start of the sequence.  *  * For example, if key was 2, the string "CAT" becomes "EDW", with the character  * 'C' rotated 2, 'A' rotated 3, and 'T' rotated 4. The string "YOU" becomes  * " RY", with 'Y' rotated 2 (wrapping around to ' '), 'R' rotated 3, and 'W'  * rotated 4.  *  * @param input THe string to be encoded  * @return An encoded string  */  String encode(String input) { // FIXME Question 4c: complete this function  return input; } /*  ASCII Character codes (for information)   32 SPACE 64 @  33 ! 65 A  34 " 66 B  35 # 67 C  36 $ 68 D  37 % 69 E  38 & 70 F  39 ' 71 G  40 ( 72 H  41 ) 73 I  42 * 74 J  43 + 75 K  44 , 76 L  45 - 77 M  46 . 78 N  47 / 79 O  48 0 80 P  49 1 81 Q  50 2 82 R  51 3 83 S  52 4 84 T  53 5 85 U  54 6 86 V  55 7 87 W  56 8 88 X  57 9 89 Y  58 : 90 Z  59 ;  60 <  61 =  62 >  63 ?  */ }