refactoring: removed unnecessary comments

src/convert_kg_to_g.c

@@ -2,5 +2,5 @@
 #include "convert_kg_to_g.h"
 
 double kg_to_gram(double kilograms) {
-    return kilograms * 1000.0; // 1 kilogram = 1000 grams
+    return kilograms * 1000.0;
 }