diff --git a/du1/output/program.exe b/du1/output/program.exe
index 5f12b80..3a6de8d 100644
Binary files a/du1/output/program.exe and b/du1/output/program.exe differ
diff --git a/du1/program.c b/du1/program.c
index 106852d..38462e6 100644
--- a/du1/program.c
+++ b/du1/program.c
@@ -58,13 +58,13 @@ int search_string (const char* heap_orig, const char* needle_orig) {
    int needle_len = strlen(needle);
 
    for (int i = 0; i <= heap_len - needle_len; i++) {
-      int j;
-         for (j = 0; j < needle_len; j++) {
-            if (heap[i+j] != needle[j]) {
+      int o;
+         for (o = 0; o < needle_len; o++) {
+            if (heap[i+o] != needle[o]) {
                break;
                }
             }
-         if (j == needle_len) {
+         if (o == needle_len) {
             return i;
          }
       }