refact: write better code and add some tests

src/day01.rs

@@ -1,45 +1,40 @@
 pub fn execute_task01(content: &str) {
-    let iter = content.lines()
-        .map(|line| line.to_string());
-    let calibration = sum_lines(iter);
+    let calibration = solve_01(content);
 
     assert_eq!(calibration, 56465);
     println!("Day01 - Task01 - Calibration: {}", calibration)
 }
 
-
 pub fn execute_task02(content: &str) {
-    let iter = content.lines()
-        .map(|line| {
-            let mut full_str = String::new();
-            for char in line.chars() {
-                full_str.push(char);
-
-                let copy = full_str.replace("one", "1")
-                    .replace("two", "2")
-                    .replace("three", "3")
-                    .replace("four", "4")
-                    .replace("five", "5")
-                    .replace("six", "6")
-                    .replace("seven", "7")
-                    .replace("eight", "8")
-                    .replace("nine", "9");
-
-                if copy != full_str {
-                    full_str = copy;
-                    full_str.push(char);
-                }
-            }
-
-            full_str
-        });
-
-    let calibration = sum_lines(iter);
+    let calibration = solve_02(content);
 
     assert_eq!(calibration, 55902);
     println!("Day01 - Task02 - Calibration: {}", calibration)
 }
 
+pub fn solve_01(data: &str) -> i32 {
+    let iter = data.lines()
+        .map(|line| line.to_string());
+    sum_lines(iter)
+}
+
+pub fn solve_02(data: &str) -> i32 {
+    let iter = data.lines()
+        .map(|line| {
+            line.replace("one", "o1e")
+                .replace("two", "t2o")
+                .replace("three", "t3e")
+                .replace("four", "f4r")
+                .replace("five", "f5e")
+                .replace("six", "s6x")
+                .replace("seven", "s7n")
+                .replace("eight", "e8t")
+                .replace("nine", "n9e")
+        });
+
+    sum_lines(iter)
+}
+
 fn sum_lines(iter: impl Iterator<Item=String>) -> i32 {
     iter
     .map(|line| format!("{}{}",
@@ -48,3 +43,30 @@ fn sum_lines(iter: impl Iterator<Item=String>) -> i32 {
     .map(|number_str| number_str.parse::<i32>().unwrap())
     .sum()
 }
+
+#[test]
+fn test_solve_01() {
+    let test_input = r#"1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet"#;
+
+    let solution = solve_01(test_input);
+
+    assert_eq!(142, solution);
+}
+
+#[test]
+fn test_solve_02() {
+    let test_input = r#"two1nine
+eightwothree
+abcone2threexyz
+xtwone3four
+4nineeightseven2
+zoneight234
+7pqrstsixteen"#;
+
+    let solution = solve_02(test_input);
+
+    assert_eq!(281, solution);
+}