Fix ext extraction to use lastDotIndex for accurate file extension

Author: AkliluMihtsun

Sprint-2/1-key-exercises/3-paths.js

@@ -12,13 +12,14 @@
 const filePath = "/Users/mitch/cyf/Module-JS1/week-1/interpret/file.txt";
 const lastSlashIndex = filePath.lastIndexOf("/");
 const base = filePath.slice(lastSlashIndex + 1);
+const lastDotIndex = base.lastIndexOf(".");
 //console.log(`The base part of ${filePath} is ${base}`);
 
 // Create a variable to store the dir part of the filePath variable
 // Create a variable to store the ext part of the variable
 
 const dir = filePath.slice(0, lastSlashIndex);
-const ext = base.slice(-4);
+const ext = base.slice(lastDotIndex);
 //console.log(dir);
 //console.log(ext);