hi

.idea/vcs.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="VcsDirectoryMappings">
-    <mapping directory="" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
   </component>
 </project>

src/main/java/io/zipcoder/StringsAndThings.java

@@ -11,7 +11,22 @@ public class StringsAndThings {
      *           countYZ("day fyyyz"); // Should return 2
      */
     public Integer countYZ(String input){
-        return null;
+        Integer countYZ = 0;
+        for (int i=0; i<input.length()-1; i++){
+            char c = input.charAt(i);
+            char c1 = input.charAt(i+1);
+            if(c == 'y' || c == 'z'){
+                if(c1 == ' '){
+                    countYZ++;
+                }
+            }
+        }
+
+        if (input.charAt(input.length()-1) == 'y' ||
+                input.charAt(input.length()-1) == 'z') {
+            countYZ++;
+        }
+        return countYZ;
     }
 
     /**
@@ -24,7 +39,9 @@ public class StringsAndThings {
      *           withoutString("Hello there", "x") // Should return "Hello there"
      */
     public String withoutString(String base, String remove){
-        return null;
+        for (int i=0; i<base.length(); i++){
+            
+        }
     }
 
     /**
@@ -36,7 +53,19 @@ public class StringsAndThings {
      *           equalIsNot("noisxxnotyynotxisi") // Should return true
      */
     public Boolean equalIsNot(String input){
-        return null;
+        int numberOfIs = 0;
+        for (int i=0; i<input.length()-1; i++){
+            if (input.charAt(i) == 'i' && input.charAt(i+1) == 's'){
+                numberOfIs++;
+            }
+        }
+        int numberOfNot = 0;
+        for (int i=1; i<input.length()-1; i++){
+            if (input.charAt(i-1) == 'n' && input.charAt(i) == 'o' && input.charAt(i+1) == 't'){
+                numberOfNot++;
+            }
+        }
+        return (numberOfIs == numberOfNot);
     }
 
     /**