first commit

r_B/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "r_B"
+version = "0.1.0"

r_B/Cargo.toml

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+[package]
+name = "r_B"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

r_B/src/main.rs

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+fn main() {
+    //borrowing => It means to allowing a function or variabe to use a value without taking
+    //ownership : type: 
+    //- immutable borrowing [read only access]
+    //- mutable borrowing [read write access]
+    let s = String::from("hello world");
+    print_strirng(&s);
+
+    let mut s1 = String::from("safal, hi");
+    change_string(&mut s1);
+    println!("{}", s1);
+
+    //ownership => It means every value in Rust has single owner, the variable responsible for it,
+    //When ownership changes, the previous owner can no longer use the value
+
+    let owner = String::from("pantsu");
+    let owner1 = owner;
+    println!("{}", owner1);
+}
+
+//borrowing but read only
+fn print_strirng(s: &String){
+    println!("{} borrowed", s);
+}
+
+fn change_string(s: &mut String){
+    s.push_str("!!");
+}
+