another try

utils/mnetftn/mnettoftn.c

@@ -488,7 +488,7 @@ int import(char *filename) {
         if (body[i] == '\r') {
             sprintf(buffer, "\r---\r * Origin: mnet->ftn (%s)", fido_addr);
             body = realloc(body, strlen(body) + strlen(buffer) + 1);
-            strcat(body, buffer);
+            strcat(&body[i], buffer);
             break;
         }
     }