add FibonacciNumber.js

Author: Vijay-K-2003

fibonacci_number/FibonacciNumber.js

@@ -17,15 +17,18 @@ function fibonacci(p) {
     }
 }
 
+function main() {
+    const readline = require('readline').createInterface({
+        input: process.stdin,
+        output: process.stdout
+      });
+      
+    readline.question("Enter value of n ", n => {
+        console.log(fibonacci(n));
+        readline.close()
+      });    
+}
 
-const readline = require('readline').createInterface({
-    input: process.stdin,
-    output: process.stdout
-  });
-  
-readline.question("Enter value of n ", n => {
-    console.log(fibonacci(n));
-    readline.close()
-  });
+main();