style: enable TodoComment in checkstyle (TheAlgorithms#5785)

* style: enable TodoComment in checkstyle

* style: remove redundant blank line

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Co-authored-by: Piotr Idzik <[email protected]>

Author: nishchalgv1

checkstyle.xml

@@ -183,7 +183,7 @@
     <!-- See https://checkstyle.org/checks/misc/index.html -->
     <module name="ArrayTypeStyle"/>
     <!-- TODO <module name="FinalParameters"/> -->
-    <!-- TODO <module name="TodoComment"/> -->
+    <module name="TodoComment"/>
     <module name="UpperEll"/>
 
     <!-- https://checkstyle.org/filters/suppressionxpathfilter.html -->