fix: 1

.gitignore

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+out/
+.idea
+AdventOfCode.iml
+

Trebuchet/CalibrationPartOne.java

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+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.StringReader;
+
+public class Calibration {
+  public static void main(String[] args) {
+    String coor = """
+        1abc2
+        pqr3stu8vwx
+        a1b2c3d4e5f
+        treb7uchet
+               """;
+
+    int total = 0;
+    try (
+        // let's first remove all the spaced lines and go through char by char
+        BufferedReader br = new BufferedReader(new FileReader("/home/ilyes/AdventOfCode/Trebuchet/Coordinates.txt"))) {
+      // BufferedReader br = new BufferedReader(new StringReader(coor))) {
+      String line;
+      while ((line = br.readLine()) != null) {
+        int first = -1;
+        int last = -1;
+        for (String c : line.split("")) {
+          // check for digits
+          if (Character.isDigit(c.charAt(0))) {
+            if (first == -1) {
+              // we add the first digit
+              first = Integer.parseInt(c);
+            }
+            // we add the last digit
+            last = Integer.parseInt(c);
+          }
+        }
+
+        // let's combine the first and the last digits then we do the addition (12 + 38
+        // + 15 + 77 = 142)
+        first = first * 10;
+        total += first + last;
+        // System.out.println(first + "" + last);
+        // the output would be
+        // 12
+        // 38
+        // 15
+        // 77 resulting in total of 142
+      }
+      System.out.println(total);
+    } catch (IOException e) {
+      // TODO Auto-generated catch block
+      e.printStackTrace();
+    }
+  }
+}

Trebuchet/CalibrationPartTwo.java

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+import java.util.HashMap;
+import java.util.Map;
+
+public class CalibrationPartTwo {
+  public static void main(String[] args) {
+    String str = """
+        two1nine
+        eightwothree
+        abcone2threexyz
+        xtwone3four
+        4nineeightseven2
+        zoneight234
+        7pqrstsixteen
+              """;
+    HahsMap<String, String> elements = new HashMap<>();
+    elements.put("one", "1");
+    elements.put("two", "2");
+    elements.put("three", "3");
+    elements.put("four", "4");
+    elements.put("five", "5");
+    elements.put("six", "6");
+    elements.put("seven", "7");
+    elements.put("eight", "8");
+    elements.put("nine", "9");
+
+    try {
+      for (String line : str.split("\n")) {
+        for (Map.Entry<String, String> entry : elements.entrySet()) {
+          line.replace(entry.getKey(), entry.getValue());
+          int first = -1;
+          int last = -1;
+        }
+        for (String c : line.split("")) {
+          System.out.println(c);
+        }
+      }
+    } catch (Exception e) {
+      // TODO: handle exception
+    }
+  }
+}