diff --git a/README.md b/README.md
index 800c892..ddb141b 100644
--- a/README.md
+++ b/README.md
@@ -25,8 +25,24 @@ Support Package For Tamedevelopers
     * [getBetweenBoxLengthAndWeightInKg](#getBetweenBoxLengthAndWeightInKg)
     * [getBetweenBoxLengthAndWeightInCMB](#getBetweenBoxLengthAndWeightInCMB)
 * [Str](#str)
-    * [byteToUnit](#byteToUnit)
-    * [sizeToBytes](#sizeToBytes)
+    * [phone](#phone)
+    * [mask](#mask)
+    * [html](#html)
+    * [text](#text)
+    * [shorten](#shorten)
+    * [random](#random)
+    * [formatString](#formatString)
+    * [encrypt](#encrypt)
+    * [decrypt](#decrypt)
+    * [bindings](#bindings)
+    * [flattenValue](#flattenValue)
+    * [exceptArray](#exceptArray)
+    * [replaceFirst](#replaceFirst)
+    * [replaceLast](#replaceLast)
+    * [removeKeysFromArray](#removeKeysFromArray)
+    * [changeKeysFromArray](#changeKeysFromArray)
+    * [convertArrayKey](#convertArrayKey)
+    * [convertArrayCase](#convertArrayCase)
 * [Zip](#zip)
     * [Unzip](#unzip)
     * [Zip Download](#zip-download)
@@ -167,7 +183,6 @@ Tame()->byteToUnit(6880);
 ```
 
 ### unitToByte
-
 ```
 Tame()->unitToByte('24mb');
 
@@ -300,6 +315,14 @@ Tame()->formatNumberToNearestThousand(1500000);
 // Output: "1.5m"
 ```
 
+## Str
+- The Core Class For String Manipulations
+    - It's helper class can be called, using -- `TameStr()`
+
+```
+Tamedevelopers\Support\Str
+``` 
+
 ## Zip
 - Takes two param as `string`
     - [sourcePath] relative path of zip-file
diff --git a/Str.php b/Str.php
index 8b65e5e..c7b99a2 100644
--- a/Str.php
+++ b/Str.php
@@ -341,7 +341,9 @@ static public function replaceLast(string $search, string $replace, string $subj
      */
     static public function formatString($string, $number = 4, $seperator = '-')
     {
-        return implode($seperator, str_split(self::trim($string), $number));
+        $string = implode($seperator, str_split(self::trim($string), $number));
+        
+        return self::replace(' ', '', $string);
     }
 
     /**
diff --git a/Tests/str.php b/Tests/str.php
index 33b68af..daa66e7 100644
--- a/Tests/str.php
+++ b/Tests/str.php
@@ -42,6 +42,8 @@
         value: 'lower'
     ),
 
+    Str::formatString('5441298192889133', 3),
+
     Str::snake('Peterso More'),
     Str::camel('peterson more'),
     Str::studly('peterson more'),