make checkstyle happy

Author: fishercoder1534

src/main/java/com/fishercoder/solutions/_670.java

@@ -25,12 +25,12 @@ public static class Solution1 {
         public int maximumSwap(int num) {
             String numStr = String.valueOf(num);
             int max = num;
-            for (int i = 0; i < numStr.length()-1; i++) {
-                for (int j = i+1; j < numStr.length(); j++) {
+            for (int i = 0; i < numStr.length() - 1; i++) {
+                for (int j = i + 1; j < numStr.length(); j++) {
                     if (numStr.charAt(i) < numStr.charAt(j)) {
                         StringBuilder sb = new StringBuilder(numStr);
-                        sb.replace(i, i+1, String.valueOf(numStr.charAt(j)));
-                        sb.replace(j, j+1, String.valueOf(numStr.charAt(i)));
+                        sb.replace(i, i + 1, String.valueOf(numStr.charAt(j)));
+                        sb.replace(j, j + 1, String.valueOf(numStr.charAt(i)));
                         max = Math.max(max, Integer.parseInt(sb.toString()));
                     }
                 }