diff --git a/src/c/a3.c b/src/c/a3.c
index 1f43a2b..7b55bbb 100644
--- a/src/c/a3.c
+++ b/src/c/a3.c
@@ -1,7 +1,6 @@
 #include "a3.h"
 #include <stdlib.h>
 #include <stdio.h>
-#include <assert.h>
 #include <memory.h>
 
 void memdump(unsigned char *string) {
@@ -36,8 +35,19 @@ void memdump(unsigned char *string) {
 
 
 int memreplace(char *string, char cin, char cout, char **caddr) {
-    //memctl
-    return 42;
+    int found = 0;
+    for (int i = 0; i < strlen(string); ++i) {
+        if(string[i] == cin) {
+            found++;
+            string[i] = cout;
+            //TODO: fix pointer assignment
+            //if(*caddr) free(caddr);
+            char *bla = &string[i];
+            caddr = &bla;
+
+        }
+    }
+    return found;
 }
 
 int main(int argc, char **argv) {
@@ -61,12 +71,11 @@ int main(int argc, char **argv) {
 
     strcpy((char *) copy, argv[1]);
 
-
     char **lastAddress = NULL;
     int count = memreplace(argv[1], *argv[2], *argv[3], lastAddress);
-
     printf("Suchzeichen wurde %i mal gefunden und ersetzt\n", count);
-    printf("zuletzt an Addresse 0x%lx \n", (unsigned long) (&lastAddress));
+    //TODO: change type
+    printf("zuletzt an Addresse 0x%02x \n", (unsigned int) &lastAddress);
     memdump(copy);
 
     free(copy);