day01: include both part 1 and 2

src/day01.zig

@@ -3,14 +3,43 @@ const util = @import("util.zig");
 
 pub fn main() !void {
     const input = @embedFile("data/day01.txt");
-    const sln = try solve(input);
-    std.debug.print("Solution: {d}", .{sln});
+    std.debug.print("{d}\n", .{try silver(input)});
+    std.debug.print("{d}\n", .{try gold(input)});
+}
+
+const zero = @as(u8, '0');
+
+fn silver(input: []const u8) !u32 {
+    var sum: u32 = 0;
+
+    var it = std.mem.splitAny(u8, input, "\n");
+    while (it.next()) |line| {
+        if (std.mem.eql(u8, "", line)) {
+            continue;
+        }
+
+        var first: u8 = 0;
+        var last: u8 = 0;
+        for (line) |char| {
+            if (char < '0' or char > '9') {
+                continue;
+            }
+            if (first == 0) {
+                first = char;
+            }
+            last = char;
+        }
+
+        const cal_value = (first - zero) * 10 + (last - zero);
+        sum += cal_value;
+    }
+
+    return sum;
 }
 
 const numbers = [_][]const u8{ "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };
-const zero = @as(u8, '0');
 
-fn solve(input: []const u8) !u32 {
+fn gold(input: []const u8) !u32 {
     var sum: u32 = 0;
 
     var it = std.mem.splitAny(u8, input, "\n");
@@ -49,7 +78,18 @@ fn solve(input: []const u8) !u32 {
     return sum;
 }
 
-test "sample" {
+test "silver" {
+    const input =
+        \\1abc2
+        \\pqr3stu8vwx
+        \\a1b2c3d4e5f
+        \\treb7uchet
+    ;
+    const sln = try silver(input);
+    try std.testing.expectEqual(@as(u32, 142), sln);
+}
+
+test "gold" {
     const input =
         \\two1nine
         \\eightwothree
@@ -59,6 +99,6 @@ test "sample" {
         \\zoneight234
         \\7pqrstsixteen
     ;
-    const sln = try solve(input);
+    const sln = try gold(input);
     try std.testing.expectEqual(@as(u32, 281), sln);
 }