diff --git a/.idea/misc.xml b/.idea/misc.xml
index 6f29fee..5af9c98 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,4 +1,3 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="21" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/src/InterviewQuestion1-3/Main.class b/src/InterviewQuestion1-3/Main.class
new file mode 100644
index 0000000..f7ff0a8
Binary files /dev/null and b/src/InterviewQuestion1-3/Main.class differ
diff --git a/src/Main.java b/src/Main.java
index 0282a9d..7140999 100644
--- a/src/Main.java
+++ b/src/Main.java
@@ -54,19 +54,57 @@ public static void main(String[] args) {
         }
         size = temp.length();
 
+
         // check the "before" buffer and size via println
         System.out.println(Arrays.toString(buffer));
         System.out.println("size: " + size);
 
         // call your method here
-
+        System.out.println("before:");
+        shiftRight2(buffer, size);
+        int newSize = replaceSpace(buffer, size);
         // check the "after" buffer contents via println
         // check to see if the new buffer's size is correct
 
-
+        System.out.println("after:");
+        shiftRight2(buffer, newSize);
     }
 
     // write your method here
+    public static int replaceSpace(char[]buffer, int size){
+        int numOfSpace =0;
+        //count number of space
+        for(int i =0; i<size; i++){
+            if(buffer[i]== ' '){
+                numOfSpace++;
+            }
+        }
+        //new size replaced with %20
+        int newSize =size+(2*numOfSpace);
+
+        for(int i = size-1; i>=0; i--){
+            if (buffer[i]==' '){
+                buffer[i+2*numOfSpace]='0';
+                buffer[i+2*numOfSpace-1]='2';
+                buffer[i+2*numOfSpace-2]='%';
+                numOfSpace--;
+            }else{
+                buffer[i+2*numOfSpace]=buffer[i];
+            }
 
+        }
+        return newSize;
+    }
+
+    //print buffer and size
+    public static void shiftRight2(char[]buffer, int size){
+        StringBuilder output = new StringBuilder();
+        for(int i =0; i<size;i++){
+            output.append(buffer[i]);
 
+        }
+        //display the buffer and size
+        System.out.println("output:"+output);
+        System.out.println("size:"+size);
+    }
 }
\ No newline at end of file