diff --git a/README.md b/README.md
index d78e92a..22838cf 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ Zielgruppe sind alle, die Mathematik besser verstehen wollen – von Schülern b
   - Klammern
   - Negative Zahlen (auch trickreich umgesetzt durch Voranstellen von 0)
   - Brüche (optional, aktuell in Entwicklung)
-  - Rechenoperatoren `+`, `-`, `*`, `:`, `/`
+  - Rechenoperatoren `+`, `-`, `*`, `:`, `/`, `^`
 
 ---
 
diff --git a/src/helping_tools/string_manipulation.rs b/src/helping_tools/string_manipulation.rs
index ae15782..8062315 100644
--- a/src/helping_tools/string_manipulation.rs
+++ b/src/helping_tools/string_manipulation.rs
@@ -9,8 +9,10 @@ pub fn strings_refactor(crazy_string: String) -> Vec<String> {
     validation_brackets_operators(&mut crazy_string_refactor);
     terms_replace_operators(&mut crazy_string_refactor);
 
-    let terms_splitted: Vec<String> = split_terms(crazy_string_refactor);
+    let mut terms_splitted: Vec<String> = split_terms(crazy_string_refactor);
+    set_operator_mul(&mut terms_splitted);
     let negative_numbers: Vec<String> = validate_negative_numbers(terms_splitted);
+
     
     return negative_numbers
 }
@@ -19,9 +21,7 @@ pub fn strings_refactor(crazy_string: String) -> Vec<String> {
 // Damit sind auch Strings in der Form " 3  +  5  * 3" möglich
 fn remove_whitespaces(with_whitespaces: &mut String) {
     let result_string: String = with_whitespaces.chars().filter(|c| !c.is_whitespace()).collect();
-
     display_terminals("Leerzeichen entfernt".to_string(), &result_string);
-
     *with_whitespaces = result_string;
 }
 
@@ -68,8 +68,8 @@ fn terms_replace_operators(splitted_equation: &mut String) {
 
     for terms in splitted_equation.chars() {
             match terms {
-                '(' => terms_replaced.push_str("( "),
-                ')' => terms_replaced.push_str(" )"),
+                '(' => terms_replaced.push_str(" ( "),
+                ')' => terms_replaced.push_str(" ) "),
                 '+' => terms_replaced.push_str( " + "),
                 '-' => terms_replaced.push_str(" - "),
                 '*' => terms_replaced.push_str(" * "),
@@ -86,7 +86,7 @@ fn terms_replace_operators(splitted_equation: &mut String) {
 // Hier werden die einzelnen Terme nochmals gesplitted, damit man besser
 // mit Ihnen rechnen kann.
 fn split_terms(splitting_terms: String) -> Vec<String> {
-    let mut splitted_terms: Vec<String> = splitting_terms.split(' ').map(str::to_string).collect();
+    let mut splitted_terms: Vec<String> = splitting_terms.split_whitespace().map(str::to_string).collect();
     if splitted_terms[0] == "" {
         splitted_terms.remove(0);
     }
@@ -94,6 +94,30 @@ fn split_terms(splitting_terms: String) -> Vec<String> {
     splitted_terms
 }
 
+fn set_operator_mul(set_operator: &mut Vec<String>) {
+    let mut index: usize = 1;
+
+    while index < set_operator.len() - 1 {
+        if index > 0 && set_operator[index] == "(" && is_number(&set_operator[index - 1].to_string()) {
+            set_operator.insert(index, "*".to_string());
+            index += 1;
+        }
+        else if index + 1 < set_operator.len() && set_operator[index] == ")" && is_number(&set_operator[index + 1].to_string()) {
+            set_operator.insert(index + 1, "*".to_string());
+            index += 1;
+        }
+        else if index > 0 && set_operator[index] == "(" && set_operator[index - 1] == ")"{
+            set_operator.insert(index, "*".to_string());
+            index += 1;
+        }
+        index += 1;
+    }
+}
+
+fn is_number(token: &str) -> bool {
+    token.parse::<f64>().is_ok()
+}
+
 // Wenn die Formel mit einem Minus anfängt, wird hier vorne eine 0 rangehängt,
 // damit die Berechnung sauber durchgeführt wird. Da die Berechnungen bei allen auf 
 // dem Prinzip "Links-Operator-Rechts" ausgeführt wird. Auch wird hier geparst wenn
diff --git a/src/main.rs b/src/main.rs
index 4977546..62d7d91 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 #![allow(dead_code)]
 
 use menue::mathtool_menue_terminal;
+use crate::arithmetic::basic_arithmetic_ops::calculation_rules::rules_for_calculation;
 
 mod paths;
 
@@ -14,7 +15,11 @@ fn main() {
     // let equation_string: String = "100+2*2-2^5*8/9-12+5/2*8+12".to_string();
     //let equation_string: String = "(3+2)^2 * (4 ^ (-3)) - 5 * (10 / (2 + 3)) + 8 ^ 2".to_string();
     //let equation_string: String = "-(5-5)".to_string();
-    //let equation_string: String = "-4 + 5/6 * (3/2 + 6 / 4) + 6 : (3/9 * 3/4 + 1)".to_string();
+    let equation_string: String = "4(6+5*10(5(2^2))123+6(5-4))".to_string();
 
-    mathtool_menue_terminal();
+    //mathtool_menue_terminal();
+
+    let splitted_terms: Vec<String> = paths::str_manipulation::strings_refactor(equation_string);
+        
+    println!("Ergebnis: {:?}", rules_for_calculation(splitted_terms));
 }
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