Add convert to pig latin mini project

Author: Syaw0

projects/convert-to-pig-latin/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "convert-to-pig-latin"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

projects/convert-to-pig-latin/src/main.rs

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+/* Task:
+Convert strings to pig latin. The first consonant of each word
+is moved to the end of the word and ay is added, so first becomes
+irst-fay. Words that start with a vowel have hay added to the end
+instead (apple becomes apple-hay). Keep in mind the details about
+UTF-8 encoding!
+*/
+
+// ===========================================================================
+
+const VOWEL_CHARS: [char; 5] = ['a', 'o', 'u', 'e', 'i'];
+
+// ===========================================================================
+
+fn main() {
+    // Tests
+    assert_eq!(convert_word_to_pig_latin("Latin"), "atin-Lay");
+    assert_eq!(convert_word_to_pig_latin("Pig"), "ig-Pay");
+    assert_eq!(convert_word_to_pig_latin("Apple"), "Apple-hay");
+
+    assert_eq!(to_pig_latin("Pig Latin"), "ig-Pay atin-Lay");
+    assert_eq!(
+        to_pig_latin("Apple Cookies Watermelon Avocado"),
+        "Apple-hay ookies-Cay atermelon-Way Avocado-hay"
+    );
+    //
+}
+
+fn convert_word_to_pig_latin(word: &str) -> String {
+    let mut chars = word.chars();
+
+    match chars.next() {
+        Some(c) if is_vowel(&c) => format!("{}-hay", word),
+        Some(c) => format!("{}-{}ay", chars.as_str(), c),
+        None => String::new(),
+    }
+}
+
+fn is_vowel(c: &char) -> bool {
+    let lower_case_char: char = c.to_lowercase().next().unwrap();
+    VOWEL_CHARS.contains(&lower_case_char)
+}
+
+fn to_pig_latin(text: &str) -> String {
+    let mut pigged = String::from(text);
+    for i in text.split_whitespace() {
+        pigged = pigged.replace(i, &convert_word_to_pig_latin(i));
+    }
+    pigged
+}