Create doubleChar.java

Author: TudorMurariu

String-2/doubleChar.java

@@ -0,0 +1,10 @@
+public String doubleChar(String str)
+    {
+        String r = "";
+        for(int i = 0;i < str.length();i++)
+        {
+            r += (str.substring(i, i+1));
+            r += (str.substring(i, i+1));
+        }
+        return r;
+    }