diff --git a/2023/rust/day1/example2 b/2023/rust/day1/example2
new file mode 100644
index 0000000..4316a6b
--- /dev/null
+++ b/2023/rust/day1/example2
@@ -0,0 +1,7 @@
+two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen
\ No newline at end of file
diff --git a/2023/rust/day1/src/main.rs b/2023/rust/day1/src/main.rs
index aea4158..2cdb7d2 100644
--- a/2023/rust/day1/src/main.rs
+++ b/2023/rust/day1/src/main.rs
@@ -1,26 +1,95 @@
 use std::fs::read_to_string;
 
-fn part1(str: &String) -> Vec<u32> {
-    let mut num_vec = Vec::new(); 
-    let line : Vec<&str> = str.split('\n').collect();
-    for l in line {
-        let num : Vec<u8> = l.as_bytes().iter().filter(|ch| ch.is_ascii_digit()).cloned().collect();
-        let mut str_num = String::new();
-        if num.len() >= 2 {
-            str_num.push(num.first().unwrap().clone() as char);
-            str_num.push(num.last().unwrap().clone() as char);
+const DIGITS : [&str; 9] = ["one", "two", "three", "four", "five", "six", "seven", "eight", "nine"];
+
+fn contains_digit(txt: &str, actual_index: usize) -> Option<usize> {
+    let mut digit_index: Option<usize> = Option::None;
+
+    for i in [3, 4, 5] {
+        let max_str = if actual_index + i >= txt.len() {
+            txt.len()
         } else {
-            str_num.push(num.first().unwrap().clone() as char);
-            str_num.push(num.first().unwrap().clone() as char);
+            actual_index + i
+        };
+        digit_index = DIGITS
+        .iter()
+        .position(|&digit| txt[actual_index..max_str].eq(digit));
+        if digit_index.is_some() {
+            break;
         }
-        num_vec.push(str_num);
+    }
+    digit_index
+}
+
+fn convert_spelled_digit(txt: &str) -> String {
+    // static variable
+    let digits_char: Vec<char> = vec!['1', '2', '3', '4', '5', '6', '7', '8', '9'];
+    // mutable variables
+    let mut finished = false;
+    let mut return_string = txt.to_string();
+
+    while !finished {
+        let mut temp_string = return_string.clone();
+        for (str_index, _) in return_string.as_bytes().iter().enumerate() {
+            if str_index == return_string.len() - 1 {
+                finished = true;
+            }
+            if let Some(i) = contains_digit(&return_string,str_index) {
+                // Transforming the string
+                let (first, last) = return_string.split_at(str_index);
+                let (_, last) = last.split_at(DIGITS[i].len());
+                temp_string = first.to_string() + digits_char[i].to_string().as_str() + last;
+                break;
+            }
+        }
+        return_string = temp_string;
+    }
+    println!("{}",return_string);
+    return_string
+}
+
+fn part1(str: &String) -> Vec<u64> {
+    let mut num_vec = Vec::new();
+    let line: Vec<&str> = str.split('\n').collect();
+    for l in line {
+        num_vec.push(algorithm(l.to_string()));
     }
     println!("{:?}", num_vec);
     num_vec.iter().map(|str| str.parse().unwrap()).collect()
 }
 
-fn main() {
-    let str = read_to_string("input").unwrap();
-    let part1_result : u32 = part1(&str).iter().sum();
-    println!("total part1: {}", part1_result);
+fn part2(str: &String) -> Vec<u64> {
+    let mut num_vec = Vec::new();
+    let line: Vec<&str> = str.split('\n').collect();
+    for l in line {
+        num_vec.push(algorithm(convert_spelled_digit(l)));
+    }
+    println!("{:?}", num_vec);
+    num_vec.iter().map(|str| str.parse().unwrap()).collect()
+}
+
+fn algorithm(str: String) -> String {
+    let num: Vec<u8> = str
+        .as_bytes()
+        .iter()
+        .filter(|ch| ch.is_ascii_digit())
+        .cloned()
+        .collect();
+    let str_num: String;
+    if num.len() == 0 {
+        str_num = "00".to_string();
+    } else if num.len() >= 2 {
+        str_num = (num.first().unwrap().clone() as char).to_string() + (num.last().unwrap().clone() as char).to_string().as_str();
+    } else {
+        str_num = (num.first().unwrap().clone() as char).to_string() + (num.first().unwrap().clone() as char).to_string().as_str();
+    }
+    str_num
+}
+
+fn main() {
+    let str = read_to_string("example2").unwrap();
+    let part1_result: u64 = part1(&str).iter().sum();
+    println!("part1 result: {}", part1_result);
+    let part2_result: u64 = part2(&str).iter().sum();
+    println!("part2 result: {}", part2_result);
 }