Add getSolutionWithPreloaded

Author: kazk

workspace/lc-test.js

@@ -12,3 +12,6 @@ export const getSolution = () => read("./solution.lc");
 
 /** Return the contents of the optional preloaded file */
 export const getPreloaded = () => read("./preloaded.lc");
+
+/** Return the contents of the preloaded file and the solution file combined */
+export const getSolutionWithPreloaded = () => getPreloaded() + "\n" + getSolution();