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hyphenSplit solution:
 if str len less than two: return str -if charAt zero equals charAt one -return charAt zero - hyphenSplit substring at one -return charAt zero plus hyphSplit substring at one
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‎Ahmad/2_puzzles/assignment_18/.classpath‎

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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-17">
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<attributes>
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<attribute name="module" value="true"/>
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</attributes>
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</classpathentry>
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<classpathentry kind="src" path="src"/>
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<classpathentry kind="output" path="bin"/>
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</classpath>

‎Ahmad/2_puzzles/assignment_18/.gitignore‎

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/bin/

‎Ahmad/2_puzzles/assignment_18/.project‎

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<?xml version="1.0" encoding="UTF-8"?>
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<projectDescription>
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<name>assignment_18</name>
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<comment></comment>
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<projects>
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</projects>
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<buildSpec>
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<buildCommand>
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<name>org.eclipse.jdt.core.javabuilder</name>
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<arguments>
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</arguments>
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</buildCommand>
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</buildSpec>
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<natures>
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<nature>org.eclipse.jdt.core.javanature</nature>
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</natures>
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</projectDescription>

‎Ahmad/2_puzzles/assignment_18/.settings/org.eclipse.core.resources.prefs‎

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eclipse.preferences.version=1
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encoding/<project>=UTF-8

‎Ahmad/2_puzzles/assignment_18/.settings/org.eclipse.jdt.core.prefs‎

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eclipse.preferences.version=1
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org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
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org.eclipse.jdt.core.compiler.codegen.targetPlatform=17
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org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
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org.eclipse.jdt.core.compiler.compliance=17
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org.eclipse.jdt.core.compiler.debug.lineNumber=generate
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org.eclipse.jdt.core.compiler.debug.localVariable=generate
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org.eclipse.jdt.core.compiler.debug.sourceFile=generate
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org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
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org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
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org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
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org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
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org.eclipse.jdt.core.compiler.release=enabled
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org.eclipse.jdt.core.compiler.source=17

‎Ahmad/2_puzzles/assignment_18/src/assignment_18/App.java‎

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package assignment_18;
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import ignore.TestingUtils;
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public class App {
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/**
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*
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Given a string, compute recursively a new string where identical chars
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that are adjacent in the original string are separated from each other by a "-".
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<br>
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<br>
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* <b>EXPECTATIONS:</b><br>
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repeatHyphen("hello") <b>---></b> hel-lo<br>
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repeatHyphen("xxyy") <b>---></b> x-xy-y <br>
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repeatHyphen("aaaa") <b>---></b> a-a-a-a <br>
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*/
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public static String hyphenSplit(String str) {
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// complete the body of this method
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if(str.length() < 2) {
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return str;
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}
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if(str.charAt(0) == str.charAt(1)) {
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return str.charAt(0) + "-" + hyphenSplit(str.substring(1));
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}
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return str.charAt(0) + hyphenSplit(str.substring(1));
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}
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//----------------------STARTING POINT OF PROGRAM. IGNORE BELOW --------------------//
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public static void main(String args[]){
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TestingUtils.runTests();
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}
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}
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‎Ahmad/2_puzzles/assignment_18/src/ignore/TestingUtils.java‎

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package ignore;
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import assignment_18.App;
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public class TestingUtils {
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public static void runTests(){
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String[] params1 = { "hello", "xxyy", "aaaa", "aaab", "aa", "a", "",
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"noadjacent", "abba", "abbba"};
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String[] expected = { "hel-lo", "x-xy-y", "a-a-a-a", "a-a-ab", "a-a", "a", "",
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"noadjacent", "ab-ba", "ab-b-ba"};
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for(int i=0; i < params1.length; i++){
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String result = App.hyphenSplit(params1[i]);
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if(result.equals(expected[i])) {
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System.out.println(printPassResult(params1[i], expected[i], result));
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} else{
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System.out.println(printFailResult(params1[i], expected[i], result));
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}
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}
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}
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private static String printPassResult(Object params1, Object expected, Object result){
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return "PASS: hyphenSplit("+ params1.toString()+ ") -> " + result.toString();
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}
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private static String printFailResult(Object params1, Object expected, Object result){
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String ret = "**********************" + "\n";
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ret += "FAIL: hyphenSplit("+ params1.toString()+ ") -> " + result.toString()
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+ " Expected: "+ expected.toString();
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ret += "\n" + "**********************";
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return ret;
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}
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}

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