chore: add hackerrank solutions

hacker-rank/time-conversion/main.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+    "bufio"
+    "fmt"
+    "io"
+    "os"
+    "strings"
+    "time"
+)
+
+/*
+ * Complete the 'timeConversion' function below.
+ *
+ * The function is expected to return a STRING.
+ * The function accepts STRING s as parameter.
+ */
+
+func timeConversion(s string) string {
+    dt, err := time.Parse("03:04:05PM", s)
+    if err != nil {
+        println(err.Error())
+        return ""
+    }
+    return dt.Format("15:04:05")
+}
+
+func main() {
+    reader := bufio.NewReaderSize(os.Stdin, 16 * 1024 * 1024)
+
+    stdout, err := os.Create(os.Getenv("OUTPUT_PATH"))
+    checkError(err)
+
+    defer stdout.Close()
+
+    writer := bufio.NewWriterSize(stdout, 16 * 1024 * 1024)
+
+    s := readLine(reader)
+
+    result := timeConversion(s)
+
+    fmt.Fprintf(writer, "%s\n", result)
+
+    writer.Flush()
+}
+
+func readLine(reader *bufio.Reader) string {
+    str, _, err := reader.ReadLine()
+    if err == io.EOF {
+        return ""
+    }
+
+    return strings.TrimRight(string(str), "\r\n")
+}
+
+func checkError(err error) {
+    if err != nil {
+        panic(err)
+    }
+}