feat(7.4): finish unit 7 lesson 4 activities

src/main/java/Unit7/U7_L4_Activity_One.java

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+package Unit7;
+
+// Have to get rid of package statement
+
+import java.util.ArrayList;
+
+public class U7_L4_Activity_One {
+    public static int countSecondInitial(ArrayList<String> list, String letter) {
+        int count = 0;
+        letter = letter.toLowerCase();
+
+        for (String word : list) {
+            if (word.substring(1, 2).toLowerCase().equals(letter)) {
+                count++;
+            }
+        }
+
+        return count;
+
+    }
+}

src/main/java/Unit7/U7_L4_Activity_Two.java

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+package Unit7;
+
+// Have to get rid of package statement
+
+import java.util.ArrayList;
+
+public class U7_L4_Activity_Two {
+    public static int searchSecond(ArrayList<String> list, String target) {
+        int count = 0;
+
+        for (int i = 0; i < list.size(); i++) {
+            if (list.get(i).equals(target)) {
+                if (count == 0) {
+                    count++;
+                } else if (count == 1) {
+                    return i;
+                }
+            }
+        }
+
+        return -1;
+    }
+}