fixed small bugs

src/RumbleBot.java

@@ -143,7 +143,7 @@ public class RumbleBot extends Bot{
 
     }
 
-    public boolean containsChar(char[] array, char target) {
+    private boolean containsChar(char[] array, char target) {
         for (char c : array) {
             if (c == target) {
                 return true;