Fix/code smells (#1338)

* ♻️ refactor: improving and fixing some code

* Updated Documentation in README.md

* ♻️ refactor: improving isLeapYear

* 🐛 chore: back changes

* 🐛 fix: using reduce instead forEach

* 🐛 fix: using reduce instead forEach

* 🐛 fix: removing duplicated code

* 🐛 chore: removing .js

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Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>

Data-Structures/Tree/Trie.js

@@ -106,8 +106,8 @@ Trie.prototype.contains = function (word) {
   // find the node with given prefix
   const node = this.findPrefix(word)
   // No such word exists
-  if (node === null || node.count === 0) return false
-  return true
+
+  return node !== null && node.count !== 0
 }
 
 Trie.prototype.findOccurrences = function (word) {