Update prepare.sh

Author: gpBlockchain

prepare.sh

@@ -3,7 +3,6 @@ set -ex
 DEFAULT_FIBER_BRANCH="develop"
 DEFAULT_FIBER_URL="https://github.com/nervosnetwork/fiber.git"
 
-
 GitFIBERBranch="${GitBranch:-$DEFAULT_FIBER_BRANCH}"
 GitFIBERUrl="${GitUrl:-$DEFAULT_FIBER_URL}"
 
@@ -17,4 +16,4 @@ cargo build --release
 cp target/release/fnn ../download/fiber/current/fnn
 cd migrate
 cargo build
-cp target/debug/fnn-migrate ../../download/fiber/current/fnn-migrate
+cp target/debug/fnn-migrate ../../download/fiber/current/fnn-migrate