rust-> palindrome program, enforces specification in #108 (#109)

* issue 108 example: rust palindrome program

* edits on gitignore file

* update to specification file

* Updated README.md

* Updated parent README

strings/README.md

@@ -25,4 +25,9 @@
 
 ### Python
 
-1. [Palindrome Check](python/palindrome.py)
+1. [Palindrome Check](python/palindrome.py)
+
+### Rust
+
+1. [Palindrome Check](rust/palindrome/README.md)
+

strings/rust/palindrome/.gitignore

@@ -0,0 +1,2 @@
+# remove the path 'target' (for cargo builds) from git
+target/

strings/rust/palindrome/Cargo.lock

@@ -0,0 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "palindrome"
+version = "1.0.0"

strings/rust/palindrome/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "palindrome"
+version = "1.0.0"
+authors = ["Goutham Krishna K V <gauthamkrishna9991@live.com>"]
+edition = "2018"
+
+# Dependencies
+
+[dependencies]

strings/rust/palindrome/README.md

@@ -0,0 +1,22 @@
+# The Palindrome Algorithm
+
+This checks whether a string is palindrome or not and returns a result.
+
+## Prerequisites
+
+- Rust (https://rust-lang.org)
+
+## Instructions for running the project
+
+- Open a terminal/powershell window in the folder/directory.
+
+- Run the following command
+
+  ```bash
+  cargo run --release
+  ```
+
+## Test Cases & Output
+- `abba` -> `true`
+- `abbcccbba` -> `true`
+- `abbccbbba` -> `false`

strings/rust/palindrome/src/main.rs

@@ -0,0 +1,38 @@
+// The Palindrome Algorithm
+// this takes in a string and returns a boolean equal to the result of
+// whether the program is palindrome or not.
+fn palindrome(s: &str) -> bool {
+    // char vector to keep the normal string
+    let string: Vec<char> = s.chars().collect();
+    // char vector to keep the reverse string
+    let mut reverse: Vec<char> = Vec::new();
+    // reverse the string and hold it in reverse.
+    for ch in &string {
+        reverse.insert(0, *ch);
+    }
+    // return whether the reverse and the normal matches
+    return string == reverse;
+}
+
+// a utility function to check the result of palindrome function
+fn check_palindrome(s: &str) {
+    if palindrome(s) {
+        println!("{} is a palindrome", s);
+    } else {
+        println!("{} is not a palindrome", s);
+    }
+}
+
+// main function
+fn main() {
+    // string 1
+    let s1 = "abba";
+    // string 2
+    let s2 = "abbcccbba";
+    // string 3
+    let s3 = "abbccbbba";
+    // call check_palindrome (internally calls palindrome) for each string
+    check_palindrome(s1);
+    check_palindrome(s2);
+    check_palindrome(s3);
+}