template header files contain function codes as well and removed redundant subfolders

Signed-off-by: Krishna Vedala <7001608+kvedala@users.noreply.github.com>

data_structures/test_queue.cpp

@@ -0,0 +1,41 @@
+#include <iostream>
+#include <string>
+
+#include "./queue.h"
+
+int main() {
+    queue<std::string> q;
+    std::cout << "---------------------- Test construct ----------------------"
+              << std::endl;
+    q.display();
+    std::cout
+        << "---------------------- Test isEmptyQueue ----------------------"
+        << std::endl;
+    if (q.isEmptyQueue())
+        std::cout << "PASS" << std::endl;
+    else
+        std::cout << "FAIL" << std::endl;
+    std::cout << "---------------------- Test enQueue ----------------------"
+              << std::endl;
+    std::cout << "After Hai, Jeff, Tom, Jkingston go into queue: " << std::endl;
+    q.enQueue("Hai");
+    q.enQueue("Jeff");
+    q.enQueue("Tom");
+    q.enQueue("Jkingston");
+    q.display();
+    std::cout << "---------------------- Test front ----------------------"
+              << std::endl;
+    std::string value = q.front();
+    if (value == "Hai")
+        std::cout << "PASS" << std::endl;
+    else
+        std::cout << "FAIL" << std::endl;
+    std::cout << "---------------------- Test deQueue ----------------------"
+              << std::endl;
+    q.display();
+    q.deQueue();
+    q.deQueue();
+    std::cout << "After Hai, Jeff left the queue: " << std::endl;
+    q.display();
+    return 0;
+}