finish chapter 8

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diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/getrandom-8cfb0822ceb3026e/dep-lib-getrandom b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/getrandom-8cfb0822ceb3026e/dep-lib-getrandom
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diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-1dc042e1675a7243/build-script-build-script-build b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-1dc042e1675a7243/build-script-build-script-build
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diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-bb0fbd26a02b55d8/dep-lib-libc b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-bb0fbd26a02b55d8/dep-lib-libc
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diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-bb0fbd26a02b55d8/lib-libc b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-bb0fbd26a02b55d8/lib-libc
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diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/ppv-lite86-ef79590992ba032d/dep-lib-ppv-lite86 b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/ppv-lite86-ef79590992ba032d/dep-lib-ppv-lite86
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diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/practice-d249a6dd684e7f90/bin-practice b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/practice-d249a6dd684e7f90/bin-practice
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\ No newline at end of file
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/rand_chacha-28db170d95e927e2/dep-lib-rand_chacha b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/rand_chacha-28db170d95e927e2/dep-lib-rand_chacha
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deleted file mode 100644
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diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/rand_core-c2b3ab9e0efd0c92/dep-lib-rand_core b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/rand_core-c2b3ab9e0efd0c92/dep-lib-rand_core
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--- a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/rand_core-c2b3ab9e0efd0c92/dep-lib-rand_core
+++ /dev/null
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/rand_core-c2b3ab9e0efd0c92/invoked.timestamp b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/rand_core-c2b3ab9e0efd0c92/invoked.timestamp
deleted file mode 100644
index e00328d..0000000
--- a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/rand_core-c2b3ab9e0efd0c92/invoked.timestamp
+++ /dev/null
@@ -1 +0,0 @@
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diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/rand_core-c2b3ab9e0efd0c92/lib-rand_core b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/rand_core-c2b3ab9e0efd0c92/lib-rand_core
deleted file mode 100644
index 8a4097f..0000000
--- a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/rand_core-c2b3ab9e0efd0c92/lib-rand_core
+++ /dev/null
@@ -1 +0,0 @@
-f4a791154877a53d
\ No newline at end of file
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/rand_core-c2b3ab9e0efd0c92/lib-rand_core.json b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/rand_core-c2b3ab9e0efd0c92/lib-rand_core.json
deleted file mode 100644
index aee41a8..0000000
--- a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/rand_core-c2b3ab9e0efd0c92/lib-rand_core.json
+++ /dev/null
@@ -1 +0,0 @@
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\ No newline at end of file