diff --git a/k&r/04-funcs-and-prog-struct/04-grep/04-grep-grace.c b/k&r/04-funcs-and-prog-struct/04-find/04-find-no-overflow.c
similarity index 100%
rename from k&r/04-funcs-and-prog-struct/04-grep/04-grep-grace.c
rename to k&r/04-funcs-and-prog-struct/04-find/04-find-no-overflow.c
diff --git a/k&r/04-funcs-and-prog-struct/04-grep/04-grep-opt.c b/k&r/04-funcs-and-prog-struct/04-find/04-find-opt.c
similarity index 100%
rename from k&r/04-funcs-and-prog-struct/04-grep/04-grep-opt.c
rename to k&r/04-funcs-and-prog-struct/04-find/04-find-opt.c
diff --git a/k&r/04-funcs-and-prog-struct/04-grep/04-grep-input.c b/k&r/04-funcs-and-prog-struct/04-grep/04-grep-input.c
deleted file mode 100644
index 77f183d..0000000
--- a/k&r/04-funcs-and-prog-struct/04-grep/04-grep-input.c
+++ /dev/null
@@ -1,15 +0,0 @@
-#include <stdio.h>
-
-#define W 80
-#define REPEAT 4000000
-
-int main()
-{
-    int i, j;
-    for (i = 0; i < REPEAT; i++) {
-        for (j = 0; j < W; j++)
-            putchar('y');
-        putchar('\n');
-    }
-    return 0;
-}