[fix] rename data_structures namespace (#1061)

* rename data_structures namespace

* spelling correction

* fix namespace doc name

data_structures/skip_list.cpp

@@ -20,10 +20,10 @@
 #include <memory>
 #include <vector>
 
-/** \namespace data_structure
+/** \namespace data_structures
  * \brief Data-structure algorithms
  */
-namespace data_structure {
+namespace data_structures {
 constexpr int MAX_LEVEL = 2;        ///< Maximum level of skip list
 constexpr float PROBABILITY = 0.5;  ///< Current probability for "coin toss"
 
@@ -198,7 +198,7 @@ class SkipList {
     }
 };
 
-}  // namespace data_structure
+}  // namespace data_structures
 
 /**
  * Main function:
@@ -208,14 +208,14 @@ class SkipList {
 int main() {
     std::srand(std::time(nullptr));
 
-    data_structure::SkipList lst;
+    data_structures::SkipList lst;
 
-    for (int j = 0; j < (1 << (data_structure::MAX_LEVEL + 1)); j++) {
-        int k = (std::rand() % (1 << (data_structure::MAX_LEVEL + 2)) + 1);
+    for (int j = 0; j < (1 << (data_structures::MAX_LEVEL + 1)); j++) {
+        int k = (std::rand() % (1 << (data_structures::MAX_LEVEL + 2)) + 1);
         lst.insertElement(k, &j);
     }
 
     lst.displayList();
-    
+
     return 0;
 }

data_structures/trie_tree.cpp

@@ -14,10 +14,10 @@
 #include <string>
 #include <vector>
 
-/** \namespace data_structure
+/** \namespace data_structures
  * \brief Data-structure algorithms
  */
-namespace data_structure {
+namespace data_structures {
 /**
  * @brief [Trie](https://en.wikipedia.org/wiki/Trie) implementation for
  * small-case English alphabets `a-z`
@@ -50,7 +50,7 @@ class trie {
     /** search a string exists inside a given root trie
      * @param str string to search for
      * @param index start index to search from
-     * @returns `tre` if found
+     * @returns `true` if found
      * @returns `false` if not found
      */
     bool search(const std::shared_ptr<trie>& root, const std::string& str,
@@ -169,14 +169,14 @@ class trie {
         return false;
     }
 };
-}  // namespace data_structure
+}  // namespace data_structures
 
 /**
  * @brief Testing function
  * @returns void
  */
 static void test() {
-    data_structure::trie root;
+    data_structures::trie root;
     root.insert("Hello");
     root.insert("World");