fix: add missing newlines at end of files

Author: DaleSeo

contains-duplicate/kimyoung.js

@@ -10,4 +10,4 @@ console.log(containsDuplicate([1, 2, 3, 1])); // true
 console.log(containsDuplicate([1, 2, 3, 4])); // false
 
 // space - O(n) - creating a set to store elements
-// time - O(n) - traverse through the array
+// time - O(n) - traverse through the array

number-of-1-bits/sun912.py

@@ -10,4 +10,4 @@ def hammingWeight(self, n: int) -> int:
             result += n % 2
             n = n//2
 
-        return result
+        return result

palindromic-substrings/kimyoung.js

@@ -26,4 +26,4 @@ console.log(countSubstrings("a")); // 1
 console.log(countSubstrings("")); // 0
 
 // space - O(1) - constant variable `result`
-// time - O(n^2) - iterating through the string and expanding both ways
+// time - O(n^2) - iterating through the string and expanding both ways

palindromic-substrings/wogha95.js

@@ -29,4 +29,4 @@ var countSubstrings = function(s) {
 
       return true;
   }
-};
+};