Fix code style

Author: tshemsedinov

Solutions/2-by-value.js

@@ -1,5 +1,5 @@
 'use strict';
 
-const inc = x => ++x;
+const inc = (x) => ++x;
 
 module.exports = { inc };

Solutions/3-by-reference.js

@@ -1,6 +1,6 @@
 'use strict';
 
-const inc = obj => {
+const inc = (obj) => {
   if (typeof obj === 'object') {
     obj.n++;
   }

Solutions/4-count-types.js

@@ -1,6 +1,6 @@
 'use strict';
 
-const countTypesInArray = arr => {
+const countTypesInArray = (arr) => {
   const counters = {};
   for (const element of arr) {
     const type = typeof element;