Made tutorial 2 work with the Solidity ^0.7.0 version

tutorial-02/myfirstcontract.sol

@@ -1,57 +1,51 @@
-pragma solidity ^0.5.0;
+pragma solidity ^0.7.0;
 
-interface Regulator {
+interface Regulator{
     function checkValue(uint amount) external returns (bool);
     function loan() external returns (bool);
 }
 
 contract Bank is Regulator {
     uint private value;
-    
-    constructor(uint amount) public {
+
+    constructor(uint amount) {
         value = amount;
     }
-
     function deposit(uint amount) public {
         value += amount;
     }
-
     function withdraw(uint amount) public {
         if (checkValue(amount)) {
-            value -= amount;
+        value -= amount;
         }
     }
-
     function balance() public view returns (uint) {
         return value;
     }
-
-    function checkValue(uint amount) public returns (bool) {
+    function checkValue(uint amount) override view public returns (bool) {
         // Classic mistake in the tutorial value should be above the amount
         return value >= amount;
     }
-
-    function loan() public returns (bool) {
+    function loan() override view public returns (bool) {
         return value > 0;
     }
 }
 
-contract MyFirstContract is Bank(10) {
+// Tutorial 01
+contract myFirstContract is Bank(10) {
+
     string private name;
     uint private age;
-    
+
     function setName(string memory newName) public {
         name = newName;
     }
-
-    function getName() public view returns (string memory) {
-        return name;
-    }
-
     function setAge(uint newAge) public {
         age = newAge;
     }
-
+    function getName() public view returns (string memory) {
+        return name;
+    }
     function getAge() public view returns (uint) {
         return age;
     }