throwaway aoc day one part 2 using zig because I suck at racket

main.zig

const std = @import("std");
const io = std.io;

fn getmatch(x: []u8) usize {
    if (std.mem.startsWith(u8, x, "1")) {
        return 1;
    } else if (std.mem.startsWith(u8, x, "2")) {
        return 2;
    } else if (std.mem.startsWith(u8, x, "3")) {
        return 3;
    } else if (std.mem.startsWith(u8, x, "4")) {
        return 4;
    } else if (std.mem.startsWith(u8, x, "5")) {
        return 5;
    } else if (std.mem.startsWith(u8, x, "6")) {
        return 6;
    } else if (std.mem.startsWith(u8, x, "7")) {
        return 7;
    } else if (std.mem.startsWith(u8, x, "8")) {
        return 8;
    } else if (std.mem.startsWith(u8, x, "9")) {
        return 9;
    } else if (std.mem.startsWith(u8, x, "one")) {
        return 1;
    } else if (std.mem.startsWith(u8, x, "two")) {
        return 2;
    } else if (std.mem.startsWith(u8, x, "three")) {
        return 3;
    } else if (std.mem.startsWith(u8, x, "four")) {
        return 4;
    } else if (std.mem.startsWith(u8, x, "five")) {
        return 5;
    } else if (std.mem.startsWith(u8, x, "six")) {
        return 6;
    } else if (std.mem.startsWith(u8, x, "seven")) {
        return 7;
    } else if (std.mem.startsWith(u8, x, "eight")) {
        return 8;
    } else if (std.mem.startsWith(u8, x, "nine")) {
        return 9;
    } else {
        return 0;
    }
}

pub fn main() !void {
    var file = try std.fs.cwd().openFile("../inputs/01.txt", .{});
    defer file.close();
    var buf_reader = io.bufferedReader(file.reader());
    var in_stream = buf_reader.reader();
    var buf: [1024]u8 = undefined;

    var ret: usize = 0;
    while (try in_stream.readUntilDelimiterOrEof(&buf, '\n')) |line| {
        const first = blk: {
            var i: usize = 0;
            while (i < line.len) {
                const x = getmatch(line[i..]);
                if (x > 0) {
                    break :blk x;
                }
                i += 1;
            }
            @panic("failed to get any tokens");
        };
        const last = blk: {
            var i: usize = line.len - 1;
            while (i >= 0) {
                const x = getmatch(line[i..]);
                if (x > 0) {
                    break :blk x;
                }
                i -= 1;
            }
            @panic("failed to get any tokens");
        };

        // std.debug.print("{d}{d}\n", .{ first, last });
        ret += 10 * first + last;
    }
    std.debug.print("{d}\n", .{ret});
}