diff --git a/src/c/a3.c b/src/c/a3.c
index de514bc..1f43a2b 100644
--- a/src/c/a3.c
+++ b/src/c/a3.c
@@ -7,21 +7,21 @@
 void memdump(unsigned char *string) {
     printf("ADDR    00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F  0123456789ABCDEF\n");
 
-    int lineLength = 16;
-    char array[lineLength * 4];
+    int columns = 16;
+    int rows = 4;
+    char array[columns * rows];
 
 
-    for(int i = 0; i <= 3; i++) {
-        //FIXME: address seems wrong
+    for(int i = 0; i < rows; i++) {
         printf("0x%02x    ", string[i]);
-        for (int j = i * lineLength; j < (i + 1) * lineLength; j++) {
+        for (int j = i * columns; j < (i + 1) * columns; j++) {
             printf("%02x ", string[j]);
             if(string[j] < 0x20 || string[j] > 0x7e) array[j] = '.';
             else array[j] = string[j];
         }
         printf(" ");
 
-        for (int j = i * lineLength; j < (i + 1) * lineLength; j++) {
+        for (int j = i * columns; j < (i + 1) * columns; j++) {
             printf("%c", array[j]);
 
         }
@@ -51,20 +51,25 @@ int main(int argc, char **argv) {
     if(buffer == NULL) return -1;
 
 
+    memdump((unsigned char *) argv[1]);
 
 
-    memdump(buffer);
+    printf("Laenge der Zeichenkette (inkl \\0): %i Bytes\n", (int) strlen(argv[1]));
+    printf("Ersetzen: '%c' mit '%c'\n", *argv[2], *argv[3]);
+
+    unsigned char *copy = malloc(4 * 16 * sizeof(char));
+
+    strcpy((char *) copy, argv[1]);
+
 
     char **lastAddress = NULL;
     int count = memreplace(argv[1], *argv[2], *argv[3], lastAddress);
 
-    printf("Laenge der Zeichenkette (inkl \\0): %i Bytes\n", (int) strlen(argv[1]));
-    printf("Ersetzen: '%c' mit '%c'\n", *argv[2], *argv[3]);
     printf("Suchzeichen wurde %i mal gefunden und ersetzt\n", count);
     printf("zuletzt an Addresse 0x%lx \n", (unsigned long) (&lastAddress));
-    memdump((unsigned char*)argv[1]);
+    memdump(copy);
 
-    free(buffer);
+    free(copy);
 
     return 0;
 }
\ No newline at end of file