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diff --git a/user/target/.rustc_info.json b/user/target/.rustc_info.json
deleted file mode 100644
index f63d3444..00000000
--- a/user/target/.rustc_info.json
+++ /dev/null
@@ -1 +0,0 @@
-{"rustc_fingerprint":18300565340359876986,"outputs":{"17103856195547239926":["___\nlib___.rlib\nlib___.a\n/home/oslab/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu\ndebug_assertions\npanic=\"abort\"\nproc_macro\ntarget_arch=\"riscv64\"\ntarget_endian=\"little\"\ntarget_env=\"\"\ntarget_feature=\"a\"\ntarget_feature=\"c\"\ntarget_feature=\"d\"\ntarget_feature=\"f\"\ntarget_feature=\"m\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_has_atomic_equal_alignment=\"16\"\ntarget_has_atomic_equal_alignment=\"32\"\ntarget_has_atomic_equal_alignment=\"64\"\ntarget_has_atomic_equal_alignment=\"8\"\ntarget_has_atomic_equal_alignment=\"ptr\"\ntarget_has_atomic_load_store=\"16\"\ntarget_has_atomic_load_store=\"32\"\ntarget_has_atomic_load_store=\"64\"\ntarget_has_atomic_load_store=\"8\"\ntarget_has_atomic_load_store=\"ptr\"\ntarget_os=\"none\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\n","warning: dropping unsupported crate type `dylib` for target `riscv64gc-unknown-none-elf`\n\nwarning: dropping unsupported crate type `cdylib` for target `riscv64gc-unknown-none-elf`\n\nwarning: dropping unsupported crate type `proc-macro` for target `riscv64gc-unknown-none-elf`\n\nwarning: 3 warnings emitted\n\n"],"17205967170045284429":["___\nlib___.rlib\nlib___.a\n/home/oslab/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu\ndebug_assertions\npanic=\"abort\"\nproc_macro\ntarget_arch=\"riscv64\"\ntarget_endian=\"little\"\ntarget_env=\"\"\ntarget_feature=\"a\"\ntarget_feature=\"c\"\ntarget_feature=\"d\"\ntarget_feature=\"f\"\ntarget_feature=\"m\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_has_atomic_equal_alignment=\"16\"\ntarget_has_atomic_equal_alignment=\"32\"\ntarget_has_atomic_equal_alignment=\"64\"\ntarget_has_atomic_equal_alignment=\"8\"\ntarget_has_atomic_equal_alignment=\"ptr\"\ntarget_has_atomic_load_store=\"16\"\ntarget_has_atomic_load_store=\"32\"\ntarget_has_atomic_load_store=\"64\"\ntarget_has_atomic_load_store=\"8\"\ntarget_has_atomic_load_store=\"ptr\"\ntarget_os=\"none\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\n","warning: dropping unsupported crate type `dylib` for target `riscv64gc-unknown-none-elf`\n\nwarning: dropping unsupported crate type `cdylib` for target `riscv64gc-unknown-none-elf`\n\nwarning: dropping unsupported crate type `proc-macro` for target `riscv64gc-unknown-none-elf`\n\nwarning: 3 warnings emitted\n\n"],"1164083562126845933":["rustc 1.49.0-nightly (cf9cf7c92 2020-11-10)\nbinary: rustc\ncommit-hash: cf9cf7c923eb01146971429044f216a3ca905e06\ncommit-date: 2020-11-10\nhost: x86_64-unknown-linux-gnu\nrelease: 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dropping unsupported crate type `dylib` for target `riscv64gc-unknown-none-elf`\n\nwarning: dropping unsupported crate type `cdylib` for target `riscv64gc-unknown-none-elf`\n\nwarning: dropping unsupported crate type `proc-macro` for target `riscv64gc-unknown-none-elf`\n\nwarning: 3 warnings emitted\n\n"]},"successes":{}}
\ No newline at end of file
diff --git a/user/target/CACHEDIR.TAG b/user/target/CACHEDIR.TAG
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@@ -1,3 +0,0 @@
-Signature: 8a477f597d28d172789f06886806bc55
-# This file is a cache directory tag created by cargo.
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deleted file mode 100644
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\ No newline at end of file
diff --git a/user/target/riscv64gc-unknown-none-elf/debug/.fingerprint/user_lib-b4124dce0aef8d75/bin-hello_world b/user/target/riscv64gc-unknown-none-elf/debug/.fingerprint/user_lib-b4124dce0aef8d75/bin-hello_world
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-src/bin/hello_world.rs:
diff --git a/user/target/riscv64gc-unknown-none-elf/debug/deps/libuser_lib-ac05933ae451745f.rlib b/user/target/riscv64gc-unknown-none-elf/debug/deps/libuser_lib-ac05933ae451745f.rlib
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-/home/oslab/workspace/v3/rCore-Tutorial-v3/user/target/riscv64gc-unknown-none-elf/debug/deps/libuser_lib-ac05933ae451745f.rlib: src/lib.rs src/console.rs src/syscall.rs src/lang_items.rs
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-src/syscall.rs:
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diff --git a/user/target/riscv64gc-unknown-none-elf/debug/hello_world b/user/target/riscv64gc-unknown-none-elf/debug/hello_world
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deleted file mode 100644
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-/home/oslab/workspace/v3/rCore-Tutorial-v3/user/target/riscv64gc-unknown-none-elf/release/deps/user_lib-0fdba27c1d499ab2.rmeta: src/lib.rs src/console.rs src/syscall.rs src/lang_items.rs
-
-/home/oslab/workspace/v3/rCore-Tutorial-v3/user/target/riscv64gc-unknown-none-elf/release/deps/libuser_lib-0fdba27c1d499ab2.rlib: src/lib.rs src/console.rs src/syscall.rs src/lang_items.rs
-
-/home/oslab/workspace/v3/rCore-Tutorial-v3/user/target/riscv64gc-unknown-none-elf/release/deps/user_lib-0fdba27c1d499ab2.d: src/lib.rs src/console.rs src/syscall.rs src/lang_items.rs
-
-src/lib.rs:
-src/console.rs:
-src/syscall.rs:
-src/lang_items.rs:
diff --git a/user/target/riscv64gc-unknown-none-elf/release/hello_world b/user/target/riscv64gc-unknown-none-elf/release/hello_world
deleted file mode 100755
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Binary files a/user/target/riscv64gc-unknown-none-elf/release/hello_world and /dev/null differ
diff --git a/user/target/riscv64gc-unknown-none-elf/release/hello_world.d b/user/target/riscv64gc-unknown-none-elf/release/hello_world.d
deleted file mode 100644
index 312f738d..00000000
--- a/user/target/riscv64gc-unknown-none-elf/release/hello_world.d
+++ /dev/null
@@ -1 +0,0 @@
-/home/oslab/workspace/v3/rCore-Tutorial-v3/user/target/riscv64gc-unknown-none-elf/release/hello_world: /home/oslab/workspace/v3/rCore-Tutorial-v3/user/src/bin/hello_world.rs /home/oslab/workspace/v3/rCore-Tutorial-v3/user/src/console.rs /home/oslab/workspace/v3/rCore-Tutorial-v3/user/src/lang_items.rs /home/oslab/workspace/v3/rCore-Tutorial-v3/user/src/lib.rs /home/oslab/workspace/v3/rCore-Tutorial-v3/user/src/syscall.rs