Change project structure to a Maven Java project + Refactor (#2816)

src/main/java/com/thealgorithms/others/RemoveDuplicateFromString.java

@@ -0,0 +1,45 @@
+package com.thealgorithms.others;
+
+import java.io.BufferedReader;
+import java.io.InputStreamReader;
+
+/**
+ * @author Varun Upadhyay (https://github.com/varunu28)
+ */
+public class RemoveDuplicateFromString {
+
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        String inpStr = br.readLine();
+
+        System.out.println("Actual string is: " + inpStr);
+        System.out.println("String after removing duplicates: " + removeDuplicate(inpStr));
+
+        br.close();
+    }
+
+    /**
+     * This method produces a string after removing all the duplicate characters
+     * from input string and returns it Example: Input String - "aabbbccccddddd"
+     * Output String - "abcd"
+     *
+     * @param s String from which duplicate characters have to be removed
+     * @return string with only unique characters
+     */
+    public static String removeDuplicate(String s) {
+        if (s == null || s.isEmpty()) {
+            return s;
+        }
+
+        StringBuilder sb = new StringBuilder();
+        int n = s.length();
+
+        for (int i = 0; i < n; i++) {
+            if (sb.toString().indexOf(s.charAt(i)) == -1) {
+                sb.append(String.valueOf(s.charAt(i)));
+            }
+        }
+
+        return sb.toString();
+    }
+}