diff --git a/src/main/java/io/zipcoder/StringsAndThings.java b/src/main/java/io/zipcoder/StringsAndThings.java
index 073467a..3cbbdf7 100644
--- a/src/main/java/io/zipcoder/StringsAndThings.java
+++ b/src/main/java/io/zipcoder/StringsAndThings.java
@@ -11,25 +11,63 @@ public class StringsAndThings {
      * but not the 'y' in "yellow" (not case sensitive). We'll say that a y or z is at the end of a word if there is not an alphabetic
      * letter immediately following it. (Note: Character.isLetter(char) tests if a char is an alphabetic letter.)
      * example : countYZ("fez day"); // Should return 2
-     *           countYZ("day fez"); // Should return 2
-     *           countYZ("day fyyyz"); // Should return 2
+     * countYZ("day fez"); // Should return 2
+     * countYZ("day fyyyz"); // Should return 2
      */
-    public Integer countYZ(String input){
-        return null;
+
+
+    public Integer countYZ(String input) {
+
+
+        String[] words = input.split(" ");
+        Integer numOfWords = 0;
+
+        for (String word : words) {
+            if (word.charAt(word.length() - 1) == 'y' || word.charAt(word.length() - 1) == 'z') {
+                numOfWords++;
+            }
+        }
+        return numOfWords;
     }
 
+
+
+        /*int count = 0;
+        String[] theArray = input.split(" ");
+        for (int i = 0; i < theArray.length; i++) {
+            String words = theArray[i];
+            int numCharact = words.length();              // THIS ALSO WORKS
+            int lastIndex = numCharact - 1;
+            char lastChar = words.charAt(lastIndex);
+            if (lastChar == 'y' || lastChar == 'z') {
+
+                count++;
+            }
+        }
+
+
+        return count;*/
+
+
+
+    //}
+
     /**
      * Given two strings, base and remove, return a version of the base string where all instances of the remove string have
      * been removed (not case sensitive). You may assume that the remove string is length 1 or more.
      * Remove only non-overlapping instances, so with "xxx" removing "xx" leaves "x".
-     *
+     * <p>
      * example : removeString("Hello there", "llo") // Should return "He there"
-     *           removeString("Hello there", "e") //  Should return "Hllo thr"
-     *           removeString("Hello there", "x") // Should return "Hello there"
+     * removeString("Hello there", "e") //  Should return "Hllo thr"
+     * removeString("Hello there", "x") // Should return "Hello there"
      */
-    public String removeString(String base, String remove){
-        return null;
-    }
+    public String removeString(String base, String remove) {
+
+          return base.replace(remove, "");
+
+
+
+   }
 
     /**
      * Given a string, return true if the number of appearances of "is" anywhere in the string is equal
@@ -40,7 +78,20 @@ public String removeString(String base, String remove){
      *           containsEqualNumberOfIsAndNot("noisxxnotyynotxisi") // Should return true
      */
     public Boolean containsEqualNumberOfIsAndNot(String input){
-        return null;
+Integer theIs = 0;
+Integer theNot = 0;
+
+for (int theChar = 0;  theChar < input.length() -1;  theChar ++ ) {
+
+    if (input.charAt(theChar) == 'i' && input.charAt(theChar + 1) == 's') { // esas letras tiene "is" (la i y s)
+        theIs++;
+    }
+    if (input.charAt(theChar) == 'n' && input.charAt(theChar + 1) == 'o' && // estas tiene "not" (n y o y t)
+            input.charAt(theChar + 2) == 't') {
+        theNot++;
+    }
+}
+        return theIs.equals(theNot);
     }
 
     /**
@@ -50,10 +101,29 @@ public Boolean containsEqualNumberOfIsAndNot(String input){
      *           gHappy("xxgxx") // Should return  false
      *           gHappy("xxggyygxx") // Should return  false
      */
-    public Boolean gIsHappy(String input){
-        return null;
+    public Boolean gIsHappy(String input) {
+
+        Boolean gIsHappy = false;
+           for (int i = 0; i < input.length() - 1; i++) {
+               if (input.charAt(i) == 'g' && input.charAt(i + 1) == 'g') {
+                   gIsHappy = true;
+                       //break;
+            }
+        }
+        return gIsHappy;
     }
 
+        /*return input.contains("gg");
+     int counter = 0;
+     int gIsHappy = 0;
+            for (int i = 0; i  < input.length() -1; i++){
+                 if (input.charAt(i) == 'g' && input.length() -1 )
+                  //if (input.charAt(i) == 'g' && input.charAt(i + 1) == 'g') {
+
+
+
+            return input.contains("gg");*/
+
 
     /**
      * We'll say that a "triple" in a string is a char appearing three times in a row.
@@ -62,7 +132,27 @@ public Boolean gIsHappy(String input){
      *            countTriple("xxxabyyyycd") // Should return 3
      *            countTriple("a") // Should return 0
      */
-    public Integer countTriple(String input){
-        return null;
+    public Integer countTriple(String input) {
+        int counter = 0;
+        input = input.toLowerCase();
+        for (int i = 0; i <= input.length() - 1; i++) {
+            if (input.charAt(i) == 'x' && input.charAt(i+1) == 'x' && input.charAt(i+2) == 'x' ||
+                    input.charAt(i) == 'y' && input.charAt(i+1) == 'y' && input.charAt(i+2) == 'y'  ) {
+                counter++;
+            }
+    }
+        return counter;
     }
 }
+
+    ///
+
+
+
+
+
+
+
+
+
+
diff --git a/src/test/java/io/zipcoder/stringsandthings/GIsHappyTest.java b/src/test/java/io/zipcoder/stringsandthings/GIsHappyTest.java
index 020cd3d..b411442 100644
--- a/src/test/java/io/zipcoder/stringsandthings/GIsHappyTest.java
+++ b/src/test/java/io/zipcoder/stringsandthings/GIsHappyTest.java
@@ -26,7 +26,7 @@ public void gIsHappyTest1(){
 
     @Test
     public void gIsHappyTest2(){
-        Boolean actual = stringsAndThings.gIsHappy("xxgxx");
+        Boolean actual = stringsAndThings.gIsHappy("gxxgxx");
         Assert.assertFalse(actual);
     }
 
diff --git a/target/classes/io/zipcoder/StringsAndThings.class b/target/classes/io/zipcoder/StringsAndThings.class
new file mode 100644
index 0000000..e0919c5
Binary files /dev/null and b/target/classes/io/zipcoder/StringsAndThings.class differ
diff --git a/target/test-classes/io/zipcoder/stringsandthings/ContainsEqualNumberOfIsAndNotTest.class b/target/test-classes/io/zipcoder/stringsandthings/ContainsEqualNumberOfIsAndNotTest.class
new file mode 100644
index 0000000..556ec64
Binary files /dev/null and b/target/test-classes/io/zipcoder/stringsandthings/ContainsEqualNumberOfIsAndNotTest.class differ
diff --git a/target/test-classes/io/zipcoder/stringsandthings/CountTripleTest.class b/target/test-classes/io/zipcoder/stringsandthings/CountTripleTest.class
new file mode 100644
index 0000000..29d3cfe
Binary files /dev/null and b/target/test-classes/io/zipcoder/stringsandthings/CountTripleTest.class differ
diff --git a/target/test-classes/io/zipcoder/stringsandthings/CountYZTest.class b/target/test-classes/io/zipcoder/stringsandthings/CountYZTest.class
new file mode 100644
index 0000000..27178e4
Binary files /dev/null and b/target/test-classes/io/zipcoder/stringsandthings/CountYZTest.class differ
diff --git a/target/test-classes/io/zipcoder/stringsandthings/GIsHappyTest.class b/target/test-classes/io/zipcoder/stringsandthings/GIsHappyTest.class
new file mode 100644
index 0000000..2e15e58
Binary files /dev/null and b/target/test-classes/io/zipcoder/stringsandthings/GIsHappyTest.class differ
diff --git a/target/test-classes/io/zipcoder/stringsandthings/RemoveStringTest.class b/target/test-classes/io/zipcoder/stringsandthings/RemoveStringTest.class
new file mode 100644
index 0000000..715f4d3
Binary files /dev/null and b/target/test-classes/io/zipcoder/stringsandthings/RemoveStringTest.class differ