added semicolons that were missing

Added semicolon to the codes that were missing

01_Day_Introduction/variable.js

@@ -1,17 +1,17 @@
 // Declaring different variables of different data types
-let firstName = 'Asabeneh' // first name of a person
-let lastName = 'Yetayeh' // last name of a person
-let country = 'Finland' // country
-let city = 'Helsinki' // capital city
-let age = 100 // age in years
-let isMarried = true
+let firstName = 'Asabeneh'; // first name of a person
+let lastName = 'Yetayeh'; // last name of a person
+let country = 'Finland'; // country
+let city = 'Helsinki'; // capital city
+let age = 100; // age in years
+let isMarried = true;
 
 // Declaring variables with number values
-const gravity = 9.81 // earth gravity  in m/s2
-const boilingPoint = 100 // water boiling point, temperature in oC
-const PI = 3.14 // geometrical constant
+const gravity = 9.81; // earth gravity  in m/s2
+const boilingPoint = 100; // water boiling point, temperature in oC
+const PI = 3.14; // geometrical constant
 
 // Variables can also be declaring in one line separated by comma
 let name = 'Asabeneh', //name of a person
   job = 'teacher',
-  live = 'Finland'
+  live = 'Finland';