Wrote program for Day 31

README.md

@@ -77,7 +77,7 @@ We encourage you to share your progress and ask questions in the Discussions sec
 | Day #28       | [Word Search](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-04/Day-28_Word-Search)                           | :white_check_mark:      |
 | Day #29       | [Traffic Light Checker](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-05/Day-29_Traffic-Light-Checker)                 | :white_check_mark:      |
 | Day #30       | [The Maximum Value](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-05/Day-30_The-Maximum-Value)                     | :white_check_mark:      |
-| Day #31       | [The Time In Words](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-05/Day-31_The-Time-In-Words)                     | :white_large_square:      |
+| Day #31       | [The Time In Words](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-05/Day-31_The-Time-In-Words)                     | :white_check_mark:      |
 | Day #32       | [Climbing The Leaderboard](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-05/Day-32_Climbing-The-Leaderboard)              | :white_large_square:      |
 | Day #33       | [WERTYU](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-05/Day-33_WERTYU)                                | :white_large_square:      |
 | Day #34       | [Primary Arithmetic](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-05/Day-34_Primary-Arithmetic)                    | :white_large_square:      |

Week-05/Day-31_The-Time-In-Words/day31/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "day31"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

Week-05/Day-31_The-Time-In-Words/day31/src/lib.rs

@@ -0,0 +1,68 @@
+fn number_to_string<'a, 'b>(number: u8) -> Result<&'a str, &'b str> {
+    match number {
+        1 => Ok("one"),
+        2 => Ok("two"),
+        3 => Ok("three"),
+        4 => Ok("four"),
+        5 => Ok("five"),
+        6 => Ok("six"),
+        7 => Ok("seven"),
+        8 => Ok("eight"),
+        9 => Ok("nine"),
+        10 => Ok("ten"),
+        11 => Ok("eleven"),
+        12 => Ok("twelve"),
+        13 => Ok("thirteen"),
+        14 => Ok("fourteen"),
+        16 => Ok("sixteen"),
+        17 => Ok("seventeen"),
+        18 => Ok("eighteen"),
+        19 => Ok("nineteen"),
+        20 => Ok("twenty"),
+        21 => Ok("twentyone"),
+        22 => Ok("twentytwo"),
+        23 => Ok("twentythree"),
+        24 => Ok("twentyfour"),
+        25 => Ok("twentyfive"),
+        26 => Ok("twentysix"),
+        27 => Ok("twentyseven"),
+        28 => Ok("twentyeight"),
+        29 => Ok("twentynine"),
+        _ => Err("Number not found"),
+    }
+}
+
+fn minute_to_string<'a>(minutes: u8) -> Result<String, &'a str> {
+    match minutes {
+        0 => Ok(String::from("o' clock")),
+        1 => Ok(String::from("one minute past")),
+        15 => Ok(String::from("quarter past")),
+        30 => Ok(String::from("half past")),
+        45 => Ok(String::from("quarter to")),
+        59 => Ok(String::from("one minute to")),
+        2..30 => Ok(format!("{} minutes past", number_to_string(minutes)?)),
+        31..59 => Ok(format!("{} minutes to", number_to_string(60 - minutes)?)),
+        _ => Err("Minute not found"),
+    }
+}
+
+pub fn time_to_string<'a>(hours: u8, minutes: u8) -> Result<String, &'a str> {
+    if (1..=12).contains(&hours) && (0..60).contains(&minutes) {
+        let hours = hours + if minutes > 30 { 1 } else { 0 };
+        if minutes == 0 {
+            Ok(format!(
+                "{} {}",
+                number_to_string(hours)?,
+                minute_to_string(minutes)?
+            ))
+        } else {
+            Ok(format!(
+                "{} {}",
+                minute_to_string(minutes)?,
+                number_to_string(hours)?
+            ))
+        }
+    } else {
+        Err("Not valid time")
+    }
+}

Week-05/Day-31_The-Time-In-Words/day31/src/main.rs

@@ -0,0 +1,50 @@
+use std::{
+    io::{self, Write},
+    process::exit,
+};
+
+use day31::time_to_string;
+
+fn main() {
+    println!("Insert the time in the format hh:mm");
+    print!("> ");
+    io::stdout().flush().expect("Failed to flush stdout");
+
+    let mut buffer = String::new();
+
+    io::stdin()
+        .read_line(&mut buffer)
+        .expect("Failed to read line");
+
+    let (hours, minutes) = match buffer.split_once(':') {
+        Some(x) => x,
+        None => {
+            eprintln!("':' not found.");
+            exit(1);
+        }
+    };
+
+    let hours = match hours.trim().parse() {
+        Ok(x) => x,
+        Err(_) => {
+            eprintln!("Hours is not a valid number");
+            exit(1);
+        }
+    };
+    let minutes = match minutes.trim().parse() {
+        Ok(x) => x,
+        Err(_) => {
+            eprintln!("Minutes is not a valid number");
+            exit(1);
+        }
+    };
+
+    let result = time_to_string(hours, minutes);
+    match result {
+        Ok(x) => println!("{x}"),
+        Err(e) => {
+            eprintln!("{e}");
+            exit(1);
+        }
+    }
+}

Week-05/Day-31_The-Time-In-Words/day31/tests/examples.rs

@@ -0,0 +1,38 @@
+#[cfg(test)]
+mod exaples {
+    use day31::time_to_string;
+
+    #[test]
+    fn example1() {
+        assert_eq!(
+            time_to_string(5, 47),
+            Ok(String::from("thirteen minutes to six"))
+        );
+    }
+
+    #[test]
+    fn example2() {
+        assert_eq!(time_to_string(3, 00), Ok(String::from("three o' clock")))
+    }
+
+    #[test]
+    fn example3() {
+        assert_eq!(
+            time_to_string(7, 15),
+            Ok(String::from("quarter past seven"))
+        );
+    }
+
+    #[test]
+    fn example4() {
+        assert_eq!(time_to_string(5, 30), Ok(String::from("half past five")));
+    }
+
+    #[test]
+    fn example5() {
+        assert_eq!(
+            time_to_string(5, 1),
+            Ok(String::from("one minute past five"))
+        );
+    }
+}