fix: Make xor output Vec<u8> (#354)

Author: Ongy

src/ciphers/xor.rs

@@ -1,5 +1,9 @@
-pub fn xor(text: &str, key: u8) -> String {
-    text.chars().map(|c| ((c as u8) ^ key) as char).collect()
+pub fn xor_bytes(text: &[u8], key: u8) -> Vec<u8> {
+    text.iter().map(|c| c ^ key).collect()
+}
+
+pub fn xor(text: &str, key: u8) -> Vec<u8> {
+    xor_bytes(text.as_bytes(), key)
 }
 
 #[cfg(test)]
@@ -10,13 +14,37 @@ mod tests {
     fn test_simple() {
         let test_string = "test string";
         let ciphered_text = xor(test_string, 32);
-        assert_eq!(test_string, xor(&ciphered_text, 32));
+        assert_eq!(test_string.as_bytes(), xor_bytes(&ciphered_text, 32));
     }
 
     #[test]
     fn test_every_alphabet_with_space() {
         let test_string = "The quick brown fox jumps over the lazy dog";
         let ciphered_text = xor(test_string, 64);
-        assert_eq!(test_string, xor(&ciphered_text, 64));
+        assert_eq!(test_string.as_bytes(), xor_bytes(&ciphered_text, 64));
+    }
+
+    #[test]
+    fn test_multi_byte() {
+        let test_string = "日本語";
+        let key = 42;
+        let ciphered_text = xor(test_string, key);
+        assert_eq!(test_string.as_bytes(), xor_bytes(&ciphered_text, key));
+    }
+
+    #[test]
+    fn test_zero_byte() {
+        let test_string = "The quick brown fox jumps over the lazy dog";
+        let key = ' ' as u8;
+        let ciphered_text = xor(test_string, key);
+        assert_eq!(test_string.as_bytes(), xor_bytes(&ciphered_text, key));
+    }
+
+    #[test]
+    fn test_invalid_byte() {
+        let test_string = "The quick brown fox jumps over the lazy dog";
+        let key = !0 as u8;
+        let ciphered_text = xor(test_string, key);
+        assert_eq!(test_string.as_bytes(), xor_bytes(&ciphered_text, key));
     }
 }

src/graph/depth_first_search_tic_tac_toe.rs

@@ -36,7 +36,7 @@ struct Position {
     y: u8,
 }
 
-#[derive(Copy, Clone, PartialEq, Debug)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug)]
 pub enum Players {
     Blank,
     PlayerX,

src/searching/interpolation_search.rs

@@ -11,7 +11,7 @@ pub fn interpolation_search<Ordering>(nums: &[i32], item: &i32) -> Result<usize,
         }
         let offset: usize = low
             + (((high - low) / (nums[high] - nums[low]) as usize) * (*item - nums[low]) as usize);
-        match nums[offset].cmp(&*item) {
+        match nums[offset].cmp(item) {
             std::cmp::Ordering::Equal => return Ok(offset),
             std::cmp::Ordering::Less => low = offset + 1,
             std::cmp::Ordering::Greater => high = offset - 1,