finish chapter 8

170 files changed, 484 insertions, 0 deletions

diff --git a/rust/theBook/chapter-7-managing-growing-projects/restaurent/Cargo.toml b/rust/theBook/chapter-7-managing-growing-projects/restaurent/Cargo.toml
new file mode 100644
index 0000000..635e1ad
--- /dev/null
+++ b/rust/theBook/chapter-7-managing-growing-projects/restaurent/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "restaurent"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/rust/theBook/chapter-7-managing-growing-projects/restaurent/src/lib.rs b/rust/theBook/chapter-7-managing-growing-projects/restaurent/src/lib.rs
new file mode 100644
index 0000000..6eb8cb5
--- /dev/null
+++ b/rust/theBook/chapter-7-managing-growing-projects/restaurent/src/lib.rs
@@ -0,0 +1,49 @@
+mod front_of_house {
+    pub mod hosting {
+        pub fn add_to_waitlist() {}
+        fn seat_at_table() {}
+    }
+
+    mod serving {
+        fn take_order() {}
+        fn serve_order() {}
+        fn take_payment() {}
+    }
+}
+
+fn deliver_order() {}
+
+mod back_of_house {
+    fn fix_incorrect_order() {
+        cook_order();
+        super::deliver_order();
+    }
+
+    fn cook_order() {}
+
+    pub struct Breakfast {
+        seasonal_fruits: String,
+        pub toast: String,
+    }
+
+    impl Breakfast {
+        pub fn summer(toast: &str) -> Self {
+            Self {
+                toast: String::from(toast),
+                seasonal_fruits: String::from("Peach"),
+            }
+        }
+    }
+}
+
+pub mod eat_at_restaurent {
+    // absolute
+//    crate::front_of_house::hosting::add_to_waitlist();
+
+    // relative
+//    front_of_house::hosting::add_to_waitlist();
+    let mut meal = back_of_house::Breakfast::summer("Rye");
+
+    meal.toast = String::from("Wheat");
+    println!("I'd like {} toast please.", meal.toast);
+}
diff --git a/rust/theBook/chapter-8-common-collections/hash/Cargo.toml b/rust/theBook/chapter-8-common-collections/hash/Cargo.toml
new file mode 100644
index 0000000..7e2371d
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/hash/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "hash"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/rust/theBook/chapter-8-common-collections/hash/src/main.rs b/rust/theBook/chapter-8-common-collections/hash/src/main.rs
new file mode 100644
index 0000000..d1e9a4c
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/hash/src/main.rs
@@ -0,0 +1,30 @@
+use std::collections::HashMap as hm;
+
+fn main() {
+    let mut scores = hm::new();
+
+    scores.insert(String::from("yellow"),10);
+    scores.insert(String::from("blue"),50);
+
+    let tm = String::from("blue");
+
+    let score = scores.get(&tm).copied().unwrap_or(0);
+
+    println!("{score}");
+
+    count_word();
+}
+
+
+fn count_word() {
+    let text = "hello world wonderful world";
+
+    let mut hp = hm::new();
+
+    for word in text.split_whitespace() {
+        let count = hp.entry(word).or_insert(0);  // or_insert return reference
+        *count += 1;
+    }
+
+    println!("{:#?}", hp);
+}
diff --git a/rust/theBook/chapter-8-common-collections/practice/Cargo.lock b/rust/theBook/chapter-8-common-collections/practice/Cargo.lock
new file mode 100644
index 0000000..6616256
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/Cargo.lock
@@ -0,0 +1,75 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "getrandom"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c05aeb6a22b8f62540c194aac980f2115af067bfe15a0734d7277a768d396b31"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi",
+]
+
+[[package]]
+name = "libc"
+version = "0.2.139"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "201de327520df007757c1f0adce6e827fe8562fbc28bfd9c15571c66ca1f5f79"
+
+[[package]]
+name = "ppv-lite86"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
+
+[[package]]
+name = "practice"
+version = "0.1.0"
+dependencies = [
+ "rand",
+]
+
+[[package]]
+name = "rand"
+version = "0.8.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
+dependencies = [
+ "libc",
+ "rand_chacha",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_chacha"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
+dependencies = [
+ "ppv-lite86",
+ "rand_core",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
+dependencies = [
+ "getrandom",
+]
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
diff --git a/rust/theBook/chapter-8-common-collections/practice/Cargo.toml b/rust/theBook/chapter-8-common-collections/practice/Cargo.toml
new file mode 100644
index 0000000..e4fb41e
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "practice"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rand = "0.8.5"
diff --git a/rust/theBook/chapter-8-common-collections/practice/src/main.rs b/rust/theBook/chapter-8-common-collections/practice/src/main.rs
new file mode 100644
index 0000000..ba63d64
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/src/main.rs
@@ -0,0 +1,87 @@
+use std::{{collections::HashMap as hm, io}};
+use rand::Rng;
+
+fn main() {
+    median();
+    pig_latin(&"appearance is the best".to_string());
+
+    add_emp();
+}
+
+fn median() {
+    // generate a list of number
+    let mut arr = Vec::new();
+    for _x in 0..100 {
+        let p = rand::thread_rng().gen_range(1..=10);
+        arr.push(p);
+    }
+
+    // count each number's appearance
+    let mut num_hash = hm::new();
+    for x in &arr {
+        let count = num_hash.entry(x).or_insert(0);
+        *count += 1;
+    }
+
+    // get most appearance
+    let mut key = 0;
+    let mut ret = 0;
+    for (k,v) in num_hash.iter() {
+        if *v > ret {
+            key = **k;
+            ret = *v;
+        }
+    }
+
+    println!("most appearance: {key} {ret}");
+}
+
+fn pig_latin(st: &String) {
+    let vowel = ['a', 'e', 'i', 'o', 'u'];
+    for w in st.split_whitespace() {
+        for v in vowel {
+            if w.starts_with(v) {
+                println!("{:?}",format!("{w}-hay"));
+                break;
+            }   else {
+                let pl = w.chars().nth(0).unwrap();
+                println!("{:?}",format!("{w}-{pl}ay"));
+                break;
+            }
+        }
+    }
+}
+
+fn add_emp() {
+    println!("Employee interface");
+
+    let mut hash: hm<String, Vec<String>> = hm::new();
+
+    loop {
+        let mut rd = String::new();
+        println!("enter name: ");
+        io::stdin()
+            .read_line(&mut rd)
+            .expect("failed to read line");
+
+        if rd.trim() == "q" {
+            break;
+        }
+
+        let mut wd = String::new();
+        println!("enter department: ");
+        io::stdin()
+            .read_line(&mut wd)
+            .expect("failed to read line");
+
+        if wd.trim() == "q" {
+            break;
+        }
+
+        hash.entry(wd).or_insert_with(Vec::new).push((*rd.trim()).to_string());
+    }
+
+    for (k,v) in &hash {
+        println!("{k} {:?}", v);
+    }
+}
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/.rustc_info.json b/rust/theBook/chapter-8-common-collections/practice/target/.rustc_info.json
new file mode 100644
index 0000000..9683918
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/.rustc_info.json
@@ -0,0 +1 @@
+{"rustc_fingerprint":1612890582466578081,"outputs":{"4614504638168534921":{"success":true,"status":"","code":0,"stdout":"rustc 1.66.0 (69f9c33d7 2022-12-12) (Arch Linux rust 1:1.66.0-1)\nbinary: rustc\ncommit-hash: 69f9c33d71c871fc16ac445211281c6e7a340943\ncommit-date: 2022-12-12\nhost: x86_64-unknown-linux-gnu\nrelease: 1.66.0\nLLVM version: 14.0.6\n","stderr":""},"10376369925670944939":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/usr\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\nunix\n","stderr":""},"15697416045686424142":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n","stderr":""}},"successes":{}}
\ No newline at end of file
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/CACHEDIR.TAG b/rust/theBook/chapter-8-common-collections/practice/target/CACHEDIR.TAG
new file mode 100644
index 0000000..20d7c31
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/CACHEDIR.TAG
@@ -0,0 +1,3 @@
+Signature: 8a477f597d28d172789f06886806bc55
+# This file is a cache directory tag created by cargo.
+# For information about cache directory tags see https://bford.info/cachedir/
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.cargo-lock b/rust/theBook/chapter-8-common-collections/practice/target/debug/.cargo-lock
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/.cargo-lock
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/cfg-if-f08ce71709a31f5f/dep-lib-cfg-if b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/cfg-if-f08ce71709a31f5f/dep-lib-cfg-if
new file mode 100644
index 0000000..1b1cb4d
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/cfg-if-f08ce71709a31f5f/dep-lib-cfg-if
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/cfg-if-f08ce71709a31f5f/invoked.timestamp b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/cfg-if-f08ce71709a31f5f/invoked.timestamp
new file mode 100644
index 0000000..e00328d
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/cfg-if-f08ce71709a31f5f/invoked.timestamp
@@ -0,0 +1 @@
+This file has an mtime of when this was started.
\ No newline at end of file
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/cfg-if-f08ce71709a31f5f/lib-cfg-if b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/cfg-if-f08ce71709a31f5f/lib-cfg-if
new file mode 100644
index 0000000..5e9cd26
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/cfg-if-f08ce71709a31f5f/lib-cfg-if
@@ -0,0 +1 @@
+4300851ec3690150
\ No newline at end of file
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/cfg-if-f08ce71709a31f5f/lib-cfg-if.json b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/cfg-if-f08ce71709a31f5f/lib-cfg-if.json
new file mode 100644
index 0000000..2539bfd
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/cfg-if-f08ce71709a31f5f/lib-cfg-if.json
@@ -0,0 +1 @@
+{"rustc":9725468309624180303,"features":"[]","target":10094334937643343087,"profile":12637318739757120569,"path":3885935413815661328,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/cfg-if-f08ce71709a31f5f/dep-lib-cfg-if"}}],"rustflags":[],"metadata":8462187951337715540,"config":2202906307356721367,"compile_kind":0}
\ No newline at end of file
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
new file mode 100644
index 0000000..1b1cb4d
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/getrandom-8cfb0822ceb3026e/dep-lib-getrandom
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/getrandom-8cfb0822ceb3026e/invoked.timestamp b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/getrandom-8cfb0822ceb3026e/invoked.timestamp
new file mode 100644
index 0000000..e00328d
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/getrandom-8cfb0822ceb3026e/invoked.timestamp
@@ -0,0 +1 @@
+This file has an mtime of when this was started.
\ No newline at end of file
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/getrandom-8cfb0822ceb3026e/lib-getrandom b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/getrandom-8cfb0822ceb3026e/lib-getrandom
new file mode 100644
index 0000000..089d3b7
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/getrandom-8cfb0822ceb3026e/lib-getrandom
@@ -0,0 +1 @@
+c12840b4af15a96c
\ No newline at end of file
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/getrandom-8cfb0822ceb3026e/lib-getrandom.json b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/getrandom-8cfb0822ceb3026e/lib-getrandom.json
new file mode 100644
index 0000000..60baf6c
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/getrandom-8cfb0822ceb3026e/lib-getrandom.json
@@ -0,0 +1 @@
+{"rustc":9725468309624180303,"features":"[\"std\"]","target":13546511942750895132,"profile":12637318739757120569,"path":6811330599694051828,"deps":[[2452538001284770427,"cfg_if",false,5765005284762517571],[10042388369396437804,"libc",false,13303432251252140425]],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/getrandom-8cfb0822ceb3026e/dep-lib-getrandom"}}],"rustflags":[],"metadata":12606519392706294666,"config":2202906307356721367,"compile_kind":0}
\ No newline at end of file
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
new file mode 100644
index 0000000..ada498f
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-1dc042e1675a7243/build-script-build-script-build
@@ -0,0 +1 @@
+85627836fbfbf752
\ No newline at end of file
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-1dc042e1675a7243/build-script-build-script-build.json b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-1dc042e1675a7243/build-script-build-script-build.json
new file mode 100644
index 0000000..afa9311
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-1dc042e1675a7243/build-script-build-script-build.json
@@ -0,0 +1 @@
+{"rustc":9725468309624180303,"features":"[]","target":2709041430195671023,"profile":12637318739757120569,"path":4550523730165278624,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/libc-1dc042e1675a7243/dep-build-script-build-script-build"}}],"rustflags":[],"metadata":14998826085014762512,"config":2202906307356721367,"compile_kind":0}
\ No newline at end of file
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-1dc042e1675a7243/dep-build-script-build-script-build b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-1dc042e1675a7243/dep-build-script-build-script-build
new file mode 100644
index 0000000..1b1cb4d
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-1dc042e1675a7243/dep-build-script-build-script-build
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-1dc042e1675a7243/invoked.timestamp b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-1dc042e1675a7243/invoked.timestamp
new file mode 100644
index 0000000..e00328d
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-1dc042e1675a7243/invoked.timestamp
@@ -0,0 +1 @@
+This file has an mtime of when this was started.
\ No newline at end of file
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-838f225ec72a982a/run-build-script-build-script-build b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-838f225ec72a982a/run-build-script-build-script-build
new file mode 100644
index 0000000..3a57cd3
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-838f225ec72a982a/run-build-script-build-script-build
@@ -0,0 +1 @@
+3feb34edd0b48c93
\ No newline at end of file
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-838f225ec72a982a/run-build-script-build-script-build.json b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-838f225ec72a982a/run-build-script-build-script-build.json
new file mode 100644
index 0000000..aab6054
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-838f225ec72a982a/run-build-script-build-script-build.json
@@ -0,0 +1 @@
+{"rustc":9725468309624180303,"features":"","target":0,"profile":0,"path":0,"deps":[[10042388369396437804,"build_script_build",false,5978524086726845061]],"local":[{"RerunIfChanged":{"output":"debug/build/libc-838f225ec72a982a/output","paths":["build.rs"]}}],"rustflags":[],"metadata":0,"config":0,"compile_kind":0}
\ No newline at end of file
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
new file mode 100644
index 0000000..1b1cb4d
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-bb0fbd26a02b55d8/dep-lib-libc
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-bb0fbd26a02b55d8/invoked.timestamp b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-bb0fbd26a02b55d8/invoked.timestamp
new file mode 100644
index 0000000..e00328d
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/.fingerprint/libc-bb0fbd26a02b55d8/invoked.timestamp
@@ -0,0 +1 @@
+This file has an mtime of when this was started.
\ No newline at end of file
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diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/incremental/practice-2ayz7xrslbyyh/s-ggt4bcth3b-z3pqnn-1cm44tl9adicy/work-products.bin b/rust/theBook/chapter-8-common-collections/practice/target/debug/incremental/practice-2ayz7xrslbyyh/s-ggt4bcth3b-z3pqnn-1cm44tl9adicy/work-products.bin
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diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/incremental/practice-2ayz7xrslbyyh/s-ggt4bcth3b-z3pqnn.lock b/rust/theBook/chapter-8-common-collections/practice/target/debug/incremental/practice-2ayz7xrslbyyh/s-ggt4bcth3b-z3pqnn.lock
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/incremental/practice-2ayz7xrslbyyh/s-ggt4bcth3b-z3pqnn.lock
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/practice b/rust/theBook/chapter-8-common-collections/practice/target/debug/practice
new file mode 100755
index 0000000..1e9aded
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/practice
diff --git a/rust/theBook/chapter-8-common-collections/practice/target/debug/practice.d b/rust/theBook/chapter-8-common-collections/practice/target/debug/practice.d
new file mode 100644
index 0000000..b67fd88
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/practice/target/debug/practice.d
@@ -0,0 +1 @@
+/home/pico/codes/rust/theBook/chapter-8-common-collections/practice/target/debug/practice: /home/pico/codes/rust/theBook/chapter-8-common-collections/practice/src/main.rs
diff --git a/rust/theBook/chapter-8-common-collections/string/Cargo.toml b/rust/theBook/chapter-8-common-collections/string/Cargo.toml
new file mode 100644
index 0000000..9eed48f
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/string/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "string"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/rust/theBook/chapter-8-common-collections/string/src/main.rs b/rust/theBook/chapter-8-common-collections/string/src/main.rs
new file mode 100644
index 0000000..c28e5b1
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/string/src/main.rs
@@ -0,0 +1,18 @@
+fn main() {
+    let mut m = String::from("Hello");
+    println!("{}",m);
+
+    m.push_str(" World");
+    println!("{}",m);
+
+    let p = ", World";
+    let l = m + &p;
+    println!("{}",l);
+
+    let z = "tic";
+    let x = "tac";
+    let c = "toe";
+
+    let s = format!("{z}-{x}{c}");
+    println!("{s}");
+}
diff --git a/rust/theBook/chapter-8-common-collections/vector/Cargo.toml b/rust/theBook/chapter-8-common-collections/vector/Cargo.toml
new file mode 100644
index 0000000..07892cc
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/vector/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "vector"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/rust/theBook/chapter-8-common-collections/vector/src/main.rs b/rust/theBook/chapter-8-common-collections/vector/src/main.rs
new file mode 100644
index 0000000..96bd094
--- /dev/null
+++ b/rust/theBook/chapter-8-common-collections/vector/src/main.rs
@@ -0,0 +1,20 @@
+fn main() {
+    let mut v = vec![1,2,3,4,5];
+
+    let op: &i32 = &v[2];
+    println!("The third element is {op}");
+
+    let op: Option<&i32> = v.get(2);
+    match op {
+        Some(i) => println!("this is {i}"),
+        None    => println!("this isn't"),
+    }
+    
+   v.push(6);
+
+    for i in &mut v {
+        *i += 50;
+        println!("{i}");
+    }
+
+}