add strings and vec

Cargo.toml

@@ -8,3 +8,16 @@ edition = "2024"
 [[bin]]
 name = "hello"
 path = "hello.rs"
+
+[[bin]]
+name = "slices2"
+path = "slices2.rs"
+
+[[bin]]
+name = "vec"
+path = "vec.rs"
+
+
+[[bin]]
+name = "strings"
+path = "strings.rs"

slices2.rs

@@ -0,0 +1,18 @@
+fn main() {
+    let arr = [1, 2, 5];
+    let slice = &arr;
+    for i in slice {
+        println!("w {}", i);
+    }
+    for j in arr {
+        println!("ww {}", j);
+    }
+    let first = slice.get(0).unwrap();
+    let last = if slice.get(3).is_some() {
+        slice.get(3).unwrap()
+    } else {
+        &-1
+    };
+
+    println!("f {} l {}", first, last);
+}

strings.rs

@@ -0,0 +1,26 @@
+fn dump(s: &str) {
+    println!("{}", s);
+}
+fn array_to_string(arr: &[i32]) -> String {
+    let mut res = "[".to_string();
+    for v in arr {
+        res += &v.to_string();
+        res += ", "
+    }
+    res.pop();
+    res.push(']');
+    res
+}
+fn main() {
+    let txt = "test test";
+    let string_text = txt.to_string();
+    let mut string_verctor = String::new();
+    string_verctor.push('H');
+    string_verctor.push_str("hii");
+    dump(&string_verctor);
+    dump(txt);
+    dump(&string_text);
+
+    let arr2 = &[3, 2, 1, 0, -1];
+    let res = array_to_string(arr2);
+}

vec.rs

@@ -0,0 +1,4 @@
+fn main() {
+    let c: Vec<i32> = vec![];
+    println!("c {}", c.get(0).unwrap());
+}