diff --git a/Assignment_007/readme.md b/Assignment_007/readme.md
index 8933d4d..30ede39 100644
--- a/Assignment_007/readme.md
+++ b/Assignment_007/readme.md
@@ -79,7 +79,7 @@ static char* allTests() {
     return 0;
 }
 
-int main() {
+int main(int argc, char** argv) {
     char *result = allTests();
 
     if (result != 0) printf("%s\n", result);
diff --git a/Assignment_007/solution/readme.md b/Assignment_007/solution/readme.md
index b3156e7..680bd7d 100644
--- a/Assignment_007/solution/readme.md
+++ b/Assignment_007/solution/readme.md
@@ -7,4 +7,4 @@ Lösung:
   * [main.c](crypto/main.c)
   * [test.c](crypto/test.c)
   * [test-text.txt](crypto/test-text.txt)
-  * [Makefile](crypto/Makefile)
\ No newline at end of file
+  * [Makefile](crypto/Makefile)
diff --git a/Assignment_007/solution/test.c b/Assignment_007/solution/test.c
index 43812e4..1489c34 100644
--- a/Assignment_007/solution/test.c
+++ b/Assignment_007/solution/test.c
@@ -8,7 +8,7 @@
                                 if (message) return message; } while (0)
 int tests_run;
 
-static char* testRoundtrip() {
+static char* testRoundtrip(void) {
     char* text = strdup("DIESXISTXEINXTEST");
     char* result = (char*) malloc(strlen(text) + 1);
     char* result2 = (char*) malloc(strlen(text) + 1);
@@ -21,7 +21,7 @@ static char* testRoundtrip() {
     return 0;
 }
 
-static char* testIllegalKey() {
+static char* testIllegalKey(void) {
     char* text = strdup("DIESXISTXEINXTEST");
     char* result = (char*) malloc(strlen(text) + 1);
     int error;
@@ -40,21 +40,21 @@ static char* testIllegalKey() {
     return 0;
 }
 
-static char* textIllegalMessage() {
+static char* textIllegalMessage(void) {
     KEY key1 = { 1, "KEY" };
     int error = encrypt(key1, "ABCD AB", NULL);
     mu_assert("Illegal char in message not detected: ABCD AB", error == E_MESSAGE_ILLEGAL_CHAR);
     return 0;
 }
 
-static char* textIllegalCypher() {
+static char* textIllegalCypher(void) {
     KEY key1 = { 1, "KEY" };
     int error = decrypt(key1, "ABCD AB", NULL);
     mu_assert("Illegal char in cypher not detected: ABCD AB", error == E_CYPHER_ILLEGAL_CHAR);
     return 0;
 }
 
-static char* allTests() {
+static char* allTests(void) {
     mu_run_test(testRoundtrip);
     mu_run_test(testIllegalKey);
     mu_run_test(textIllegalMessage);
@@ -62,7 +62,7 @@ static char* allTests() {
     return 0;
 }
 
-int main() {
+int main(int argc, char** argv) {
     char *result = allTests();
 
     if (result != 0) printf("%s\n", result);
diff --git a/Assignment_014/solution/strings.c b/Assignment_014/solution/strings.c
index 9812aba..9f6ede7 100644
--- a/Assignment_014/solution/strings.c
+++ b/Assignment_014/solution/strings.c
@@ -17,7 +17,7 @@ void manipulate_text(char* text) {
     printf("Manipulierter Text: %s\n", copiedText);
 }
 
-int main() {
+int main(int argc, char** argv) {
     char text[100];
 
     printf("Geben Sie einen Text ein: ");
diff --git a/Assignment_019/solution/function_pointer.c b/Assignment_019/solution/function_pointer.c
index 4d3d17b..3787137 100644
--- a/Assignment_019/solution/function_pointer.c
+++ b/Assignment_019/solution/function_pointer.c
@@ -59,7 +59,7 @@ void to_console_ucase(const char* data) {
     free(ucase);
 }
 
-int main() {
+int main(int argc, char** argv) {
     const char* data[] = { "Daten 1", "Daten 2", "Daten 3" };
     int count = sizeof(data) / sizeof(data[0]);
 
diff --git a/Assignment_021/solution/union.c b/Assignment_021/solution/union.c
index 7d82d88..a7514d5 100644
--- a/Assignment_021/solution/union.c
+++ b/Assignment_021/solution/union.c
@@ -24,7 +24,7 @@ void print_number(number_t zahl, number_type typ) {
     }
 }
 
-int main() {
+int main(int argc, char** argv) {
     number_t zahl;
     number_type typ;
 
diff --git a/Assignment_022/readme.md b/Assignment_022/readme.md
index 2f1bbd5..038f032 100644
--- a/Assignment_022/readme.md
+++ b/Assignment_022/readme.md
@@ -1,4 +1,4 @@
-# Assignment: Vektor (heap-basiert)
+# Vektor (heap-basiert)
 
 📆 **Fällig: ----** 📆 [Musterlösung](solution/)
 
diff --git a/Assignment_022/solution/vector_heap.c b/Assignment_022/solution/vector_heap.c
index c63c00c..210ba99 100644
--- a/Assignment_022/solution/vector_heap.c
+++ b/Assignment_022/solution/vector_heap.c
@@ -17,7 +17,7 @@ Vector* vec_new(double x, double y, double z) {
     return result;
 }
 
-Vector* vec_new_null() {
+Vector* vec_new_null(void) {
     return vec_new(0.0,
                    0.0,
                    0.0);
diff --git a/Assignment_022/solution/vector_heap_test.c b/Assignment_022/solution/vector_heap_test.c
index 60640bd..d0b7e8c 100644
--- a/Assignment_022/solution/vector_heap_test.c
+++ b/Assignment_022/solution/vector_heap_test.c
@@ -4,7 +4,7 @@
 #include "minitest.h"
 #include "vector_heap.h"
 
-static char* test_creation() {
+static char* test_creation(void) {
     Vector* vec = vec_new(3.0, 1.0, -5.0);
      mu_assert("Equal x", vec->x == 3.0);
      mu_assert("Equal y", vec->y == 1.0);
@@ -16,14 +16,14 @@ static char* test_creation() {
 
 static int tests_run;
 
-static char* allTests() {
+static char* allTests(void) {
     mu_run_test(test_creation);
     /* Weitere Tests hier einfügen */
 
     return 0;
 }
 
-int main() {
+int main(int argc, char** argv) {
     char *result = allTests();
 
     if (result != 0) printf("%s\n", result);
diff --git a/Assignment_022/vector_heap_test.c b/Assignment_022/vector_heap_test.c
index 60640bd..d0b7e8c 100644
--- a/Assignment_022/vector_heap_test.c
+++ b/Assignment_022/vector_heap_test.c
@@ -4,7 +4,7 @@
 #include "minitest.h"
 #include "vector_heap.h"
 
-static char* test_creation() {
+static char* test_creation(void) {
     Vector* vec = vec_new(3.0, 1.0, -5.0);
      mu_assert("Equal x", vec->x == 3.0);
      mu_assert("Equal y", vec->y == 1.0);
@@ -16,14 +16,14 @@ static char* test_creation() {
 
 static int tests_run;
 
-static char* allTests() {
+static char* allTests(void) {
     mu_run_test(test_creation);
     /* Weitere Tests hier einfügen */
 
     return 0;
 }
 
-int main() {
+int main(int argc, char** argv) {
     char *result = allTests();
 
     if (result != 0) printf("%s\n", result);
diff --git a/Assignment_023/readme.md b/Assignment_023/readme.md
index ee4dd50..9dd103c 100644
--- a/Assignment_023/readme.md
+++ b/Assignment_023/readme.md
@@ -1,4 +1,4 @@
-# Assignment: Vektor (stack-basiert)
+# Vektor (stack-basiert)
 
 📆 **Fällig: ----** 📆 [Musterlösung](solution/)
 
diff --git a/Assignment_023/solution/readme.md b/Assignment_023/solution/readme.md
index 1f77ea0..7296134 100644
--- a/Assignment_023/solution/readme.md
+++ b/Assignment_023/solution/readme.md
@@ -8,4 +8,4 @@ Lösung:
   * [vector_stack_benchmark.c](vector_stack_benchmark.c)
   * [vector_stack.c](vector_stack.c)
   * [vector_stack.h](vector_stack.h)
-  * [vector_stack_test.c](vector_stack_test.c)
\ No newline at end of file
+  * [vector_stack_test.c](vector_stack_test.c)
diff --git a/Assignment_023/solution/vector_stack_test.c b/Assignment_023/solution/vector_stack_test.c
index 5b143c4..3ac70f5 100644
--- a/Assignment_023/solution/vector_stack_test.c
+++ b/Assignment_023/solution/vector_stack_test.c
@@ -4,7 +4,7 @@
 #include "minitest.h"
 #include "vector_stack.h"
 
-static char* test_creation() {
+static char* test_creationvoid {
     Vector vec;
     vec_init(&vec, 3.0, 1.0, -5.0);
 
@@ -19,14 +19,14 @@ static char* test_creation() {
 
 static int tests_run;
 
-static char* allTests() {
+static char* allTests(void) {
     mu_run_test(test_creation);
     /* Alle Testmethoden hier rufen */
 
     return 0;
 }
 
-int main() {
+int main(int argc, char** argv) {
     char *result = allTests();
 
     if (result != 0) printf("%s\n", result);
diff --git a/Assignment_023/vector_stack_test.c b/Assignment_023/vector_stack_test.c
index 5b143c4..3ac70f5 100644
--- a/Assignment_023/vector_stack_test.c
+++ b/Assignment_023/vector_stack_test.c
@@ -4,7 +4,7 @@
 #include "minitest.h"
 #include "vector_stack.h"
 
-static char* test_creation() {
+static char* test_creationvoid {
     Vector vec;
     vec_init(&vec, 3.0, 1.0, -5.0);
 
@@ -19,14 +19,14 @@ static char* test_creation() {
 
 static int tests_run;
 
-static char* allTests() {
+static char* allTests(void) {
     mu_run_test(test_creation);
     /* Alle Testmethoden hier rufen */
 
     return 0;
 }
 
-int main() {
+int main(int argc, char** argv) {
     char *result = allTests();
 
     if (result != 0) printf("%s\n", result);
diff --git a/Assignment_028/solution/socket_server.c b/Assignment_028/solution/socket_server.c
index 154075b..6462aef 100644
--- a/Assignment_028/solution/socket_server.c
+++ b/Assignment_028/solution/socket_server.c
@@ -18,7 +18,7 @@
 #define PORT 8080
 #define BUFFER_SIZE 1024
 
-int main() {
+int main(int argc, char** argv) {
     int server_fd, new_socket;
     struct sockaddr_in address;
     int addrlen = sizeof(address);
diff --git a/Assignment_029/solution/threads.c b/Assignment_029/solution/threads.c
index 29cb5fd..0bf1e71 100644
--- a/Assignment_029/solution/threads.c
+++ b/Assignment_029/solution/threads.c
@@ -14,7 +14,7 @@ void* task(void* arg) {
     pthread_exit(NULL);
 }
 
-int main() {
+int main(int argc, char** argv) {
     pthread_t threads[NUM_THREADS];
 
     for (int i = 0; i < NUM_THREADS; i++) {
diff --git a/readme.md b/readme.md
index abcd18e..d310e51 100644
--- a/readme.md
+++ b/readme.md
@@ -6,34 +6,34 @@ Die **Abgabedaten** haben keine Bedeutung, da der Kurs keine Prüfung beinhaltet
 
 ## Themenüberblick
 
-| #  | Thema                                                                                        | Fällig am 📆   |
-|----|----------------------------------------------------------------------------------------------|----------------|
-| 1. | [Simples Hello-World-Programm](Assignment_001/readme.md)                                     | **----**       |
-| 2. | [Simples Hello-World-Programm mit #define](Assignment_002/readme.md)                         | **----**       |
-| 3. | [Kommandozeilenargumente ausgeben](Assignment_003/readme.md)                                 | **----**       |
-| 4. | [Hello-World-Programm, das den Namen von der Kommandozeile nimmt](Assignment_004/readme.md)  | **----**       |
-| 5. | [Simples Hello-World-Programm mit externer Funktion](Assignment_005/readme.md)               | **----**       |
-| 6. | [Zahlenraten](Assignment_006/readme.md)                                                      | **----**       |
-| 7. | [Verschlüsselung in C](Assignment_007/readme.md)                                             | **----**       |
-| 8. | [Countdown](Assignment_008/readme.md)                                                        | **----**       |
-| 9. | [Größe von Datentypen](Assignment_009/readme.md)                                             | **----**       |
-| 10. | [Vertauschen von zwei Integer-Werte](Assignment_010/readme.md)                               | **----**       |
-| 11. | [Leet Speak](Assignment_011/readme.md)                                                       | **----**       |
-| 12. | [Array ausgeben](Assignment_012/readme.md)                                                   | **----**       |
-| 13. | [Array mit Pointer-Arithmetik ausgeben](Assignment_013/readme.md)                            | **----**       |
-| 14. | [String-Verarbeitung](Assignment_014/readme.md)                                              | **----**       |
-| 15. | [String umdrehen](Assignment_015/readme.md)                                                  | **----**       |
-| 16. | [Vararg Funktion schreiben](Assignment_016/readme.md)                                        | **----**       |
-| 17. | [typedef verwenden](Assignment_017/readme.md)                                                | **----**       |
-| 18. | [Dynamische Speicherverwaltung mit malloc und free](Assignment_018/readme.md)                | **----**       |
-| 19. | [Funktionspointer benutzen](Assignment_019/readme.md)                                        | **----**       |
-| 20. | [Struct verwenden](Assignment_020/readme.md)                                                 | **----**       |
-| 21. | [Union verwenden](Assignment_021/readme.md)                                                  | **----**       |
-| 22. | [Vektor (heap-basiert)](Assignment_022/readme.md)                                            | **----**       |
-| 23. | [Vektor (stack-basiert)](Assignment_023/readme.md)                                           | **----**       |
-| 24. | [Datei auf der Konsole aufgeben](Assignment_024/readme.md)                                   | **----**       |
-| 25. | [Datei auf der Konsole mit Zeilennummern aufgeben](Assignment_025/readme.md)                 | **----**       |
-| 26. | [Datei lesen und schreiben](Assignment_026/readme.md)                                        | **----**       |
-| 27. | [Rechner mit Pipes](Assignment_027/readme.md)                                                | **----**       |
-| 28. | [Socket-Client und -Server programmieren](Assignment_028/readme.md)                          | **----**       |
-| 29. | [POSIX-Threads](Assignment_029/readme.md)                                                    | **----**       |
+| #   | Thema                                                                                        | Fällig am 📆   | Musterlösung  |
+|-----|----------------------------------------------------------------------------------------------|----------------|----------------|
+| 1.  | [Simples Hello-World-Programm](Assignment_001/readme.md)                                     | **----**       |  [✅](Assignment_001/solution/) |
+| 2.  | [Simples Hello-World-Programm mit #define](Assignment_002/readme.md)                         | **----**       |  [✅](Assignment_002/solution/) |
+| 3.  | [Kommandozeilenargumente ausgeben](Assignment_003/readme.md)                                 | **----**       |  [✅](Assignment_003/solution/) |
+| 4.  | [Hello-World-Programm, das den Namen von der Kommandozeile nimmt](Assignment_004/readme.md)  | **----**       |  [✅](Assignment_004/solution/) |
+| 5.  | [Simples Hello-World-Programm mit externer Funktion](Assignment_005/readme.md)               | **----**       |  [✅](Assignment_005/solution/) |
+| 6.  | [Zahlenraten](Assignment_006/readme.md)                                                      | **----**       |  [✅](Assignment_006/solution/) |
+| 7.  | [Verschlüsselung in C](Assignment_007/readme.md)                                             | **----**       |  [✅](Assignment_007/solution/) |
+| 8.  | [Countdown](Assignment_008/readme.md)                                                        | **----**       |  [✅](Assignment_008/solution/) |
+| 9.  | [Größe von Datentypen](Assignment_009/readme.md)                                             | **----**       |  [✅](Assignment_009/solution/) |
+| 10. | [Vertauschen von zwei Integer-Werte](Assignment_010/readme.md)                               | **----**       |  [✅](Assignment_010/solution/) |
+| 11. | [Leet Speak](Assignment_011/readme.md)                                                       | **----**       |  [✅](Assignment_011/solution/) |
+| 12. | [Array ausgeben](Assignment_012/readme.md)                                                   | **----**       |  [✅](Assignment_012/solution/) |
+| 13. | [Array mit Pointer-Arithmetik ausgeben](Assignment_013/readme.md)                            | **----**       |  [✅](Assignment_013/solution/) |
+| 14. | [String-Verarbeitung](Assignment_014/readme.md)                                              | **----**       |  [✅](Assignment_014/solution/) |
+| 15. | [String umdrehen](Assignment_015/readme.md)                                                  | **----**       |  [✅](Assignment_015/solution/) |
+| 16. | [Vararg Funktion schreiben](Assignment_016/readme.md)                                        | **----**       |  [✅](Assignment_016/solution/) |
+| 17. | [typedef verwenden](Assignment_017/readme.md)                                                | **----**       |  [✅](Assignment_017/solution/) |
+| 18. | [Dynamische Speicherverwaltung mit malloc und free](Assignment_018/readme.md)                | **----**       |  [✅](Assignment_018/solution/) |
+| 19. | [Funktionspointer benutzen](Assignment_019/readme.md)                                        | **----**       |  [✅](Assignment_019/solution/) |
+| 20. | [Struct verwenden](Assignment_020/readme.md)                                                 | **----**       |  [✅](Assignment_020/solution/) |
+| 21. | [Union verwenden](Assignment_021/readme.md)                                                  | **----**       |  [✅](Assignment_021/solution/) |
+| 22. | [Vektor (heap-basiert)](Assignment_022/readme.md)                                            | **----**       |  [✅](Assignment_022/solution/) |
+| 23. | [Vektor (stack-basiert)](Assignment_023/readme.md)                                           | **----**       |  [✅](Assignment_023/solution/) |
+| 24. | [Datei auf der Konsole aufgeben](Assignment_024/readme.md)                                   | **----**       |  [✅](Assignment_024/solution/) |
+| 25. | [Datei auf der Konsole mit Zeilennummern aufgeben](Assignment_025/readme.md)                 | **----**       |  [✅](Assignment_025/solution/) |
+| 26. | [Datei lesen und schreiben](Assignment_026/readme.md)                                        | **----**       |  [✅](Assignment_026/solution/) |
+| 27. | [Rechner mit Pipes](Assignment_027/readme.md)                                                | **----**       |  [✅](Assignment_027/solution/) |
+| 28. | [Socket-Client und -Server programmieren](Assignment_028/readme.md)                          | **----**       |  [✅](Assignment_028/solution/) |
+| 29. | [POSIX-Threads](Assignment_029/readme.md)                                                    | **----**       |  [✅](Assignment_029/solution/) |