diff --git a/examples/callback/callback.c b/examples/callback/callback.c
index d4e9ad0..3a803b1 100644
--- a/examples/callback/callback.c
+++ b/examples/callback/callback.c
@@ -181,18 +181,15 @@ static unsigned char affine_nnb[] = {
     0x10, 0x00, 0x00, 0x00};
 
 /// @brief dummy input data.
-static unsigned char input[] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
-                                0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
-                                0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
-                                0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
-                                0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
-                                0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
-                                0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
-                                0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40,
-                                0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
-                                0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50,
-                                0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
-                                0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60};
+static unsigned char input[] = {
+    0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c,
+    0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
+    0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24,
+    0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
+    0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c,
+    0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
+    0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53, 0x54,
+    0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60};
 
 /// @brief Example callback for execute function.
 /// It does nothing but just print function name itself.