i moved the cheese and cut it too

StringParser.java

      */
     public static String upperCaseString(String s)
     {
-        return null;
+        return (s.toUpperCase());
     }
 
     /**
      * @return String
      */
     public static String lowerCaseString(String s) {
-        return null;
+        return (s.toLowerCase());
     }
 
     /**
      * @return String
      */
     public static Character getFirstCharacter(String s) {
-        return null;
+        
+        return s.charAt(0);
     }
 
     /**
      * @return String
      */
     public static Character getNthCharacter(String s, Integer n) {
-        return null;
+        
+        return s.charAt(n);
     }
 
     /**
      * @return String
      */
     public static String upperCaseFirstCharacter(String s) {
-        return null;
+        return s.substring(0, 1).toUpperCase() + s.substring(1);
     }
 
     /**
      * @return String
      */
     public static String camelCaseString(String s) {
-        return null;
+        String st = new String(); 
+        String[] stArr = s.split(" ",-1);
+        for(String str : stArr){
+            st += str.substring(0,1).toUpperCase()+str.substring(1).toLowerCase();    
+            }
+            return st;
     }
 
     /**
      * @return String
      */
     public static String snakeCaseString(String s) {
-        return null;
+        String serpent = new String();
+        s=s.toLowerCase();
+        serpent=s.replaceAll(" ","_");
+        return serpent;
     }
 
     /**
      * @return String
      */
     public static Integer getLength(String s) {
-        return null;
+        return (s.length());
     }
 
     /**
      * @return String
      */
     public static Boolean isEqual(String s1, String s2) {
-        return null;
+        return s1.equals(s2);
     }
 
     /**
      * @return String
      */
     public static Boolean isEqualIgnoreCase(String s1, String s2) {
-        return null;
+        return s2.equalsIgnoreCase(s1);
     }
 }