add fix (#174)

Author: ashmichheda

src/main/java/com/fishercoder/solutions/_1844.java

@@ -14,4 +14,14 @@ public String replaceDigits(String s) {
             return sb.toString();
         }
     }
+    public static class Solution2 {
+        public String replaceDigits(String s) {
+
+            char inpArr[] = s.toCharArray();
+            for(int i = 1; i < inpArr.length; i+= 2) {
+                inpArr[i] = (char) (inpArr[i - 1] + inpArr[i] - '0');
+            }
+            return String.valueOf(inpArr);
+        }
+    }
 }

src/test/java/com/fishercoder/_1844Test.java

@@ -0,0 +1,26 @@
+package com.fishercoder;
+
+import com.fishercoder.solutions._1844;
+import org.junit.Assert;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+
+public class _1844Test {
+    private static _1844.Solution2 solution2;
+    private static String s;
+    private static String actual;
+
+    @BeforeClass
+    public static void setup() {
+        solution2 = new _1844.Solution2();
+    }
+
+    @Test
+    public void test1() {
+        s = "a1c1e1";
+        actual = "abcdef";
+        String expected = solution2.replaceDigits(s);
+        Assert.assertEquals(actual, expected);
+    }
+}