diff --git a/Cargo.lock b/Cargo.lock
index 2e3fc04..13f0b6e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -47,9 +47,9 @@ checksum = "0942ffc6dcaadf03badf6e6a2d0228460359d5e34b57ccdc720b7382dfbd5ec5"
 
 [[package]]
 name = "anstream"
-version = "0.6.4"
+version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2ab91ebe16eb252986481c5b62f6098f3b698a45e34b5b98200cf20dd2484a44"
+checksum = "d664a92ecae85fd0a7392615844904654d1d5f5514837f471ddef4a057aba1b6"
 dependencies = [
  "anstyle",
  "anstyle-parse",
@@ -67,30 +67,30 @@ checksum = "7079075b41f533b8c61d2a4d073c4676e1f8b249ff94a393b0595db304e0dd87"
 
 [[package]]
 name = "anstyle-parse"
-version = "0.2.2"
+version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "317b9a89c1868f5ea6ff1d9539a69f45dffc21ce321ac1fd1160dfa48c8e2140"
+checksum = "c75ac65da39e5fe5ab759307499ddad880d724eed2f6ce5b5e8a26f4f387928c"
 dependencies = [
  "utf8parse",
 ]
 
 [[package]]
 name = "anstyle-query"
-version = "1.0.0"
+version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5ca11d4be1bab0c8bc8734a9aa7bf4ee8316d462a08c6ac5052f888fef5b494b"
+checksum = "e28923312444cdd728e4738b3f9c9cac739500909bb3d3c94b43551b16517648"
 dependencies = [
- "windows-sys 0.48.0",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
 name = "anstyle-wincon"
-version = "3.0.1"
+version = "3.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f0699d10d2f4d628a98ee7b57b289abbc98ff3bad977cb3152709d4bf2330628"
+checksum = "1cd54b81ec8d6180e24654d0b371ad22fc3dd083b6ff8ba325b72e00c87660a7"
 dependencies = [
  "anstyle",
- "windows-sys 0.48.0",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -220,9 +220,9 @@ checksum = "a2bd12c1caf447e69cd4528f47f94d203fd2582878ecb9e9465484c4148a8223"
 
 [[package]]
 name = "calamine"
-version = "0.23.0"
+version = "0.23.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cab44c09d2f3dae84fdb1784ee6b96eddb6595c1139b8df9d3d6ba6ab25dabe2"
+checksum = "47a4d6ea525ea187df1e3a1c4b23469b1cbe60c5bafc1c0ef14b2b8738a8303d"
 dependencies = [
  "byteorder",
  "codepage",
@@ -279,7 +279,7 @@ dependencies = [
  "heck",
  "proc-macro2",
  "quote",
- "syn 2.0.39",
+ "syn 2.0.41",
 ]
 
 [[package]]
@@ -318,9 +318,9 @@ dependencies = [
 
 [[package]]
 name = "const-oid"
-version = "0.9.5"
+version = "0.9.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
+checksum = "c2459377285ad874054d797f3ccebf984978aa39129f6eafde5cdc8315b612f8"
 
 [[package]]
 name = "core-foundation"
@@ -373,9 +373,9 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-queue"
-version = "0.3.8"
+version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d1cfb3ea8a53f37c40dea2c7bedcbd88bdfae54f5e2175d6ecaff1c988353add"
+checksum = "b9bcf5bdbfdd6030fb4a1c497b5d5fc5921aa2f60d359a17e249c0e6df3de153"
 dependencies = [
  "cfg-if",
  "crossbeam-utils",
@@ -383,9 +383,9 @@ dependencies = [
 
 [[package]]
 name = "crossbeam-utils"
-version = "0.8.16"
+version = "0.8.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5a22b2d63d4d1dc0b7f1b6b2747dd0088008a9be28b6ddf0b1e7d335e3037294"
+checksum = "c06d96137f14f244c37f989d9fff8f95e6c18b918e71f36638f8c49112e4c78f"
 dependencies = [
  "cfg-if",
 ]
@@ -752,9 +752,9 @@ checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
 
 [[package]]
 name = "hkdf"
-version = "0.12.3"
+version = "0.12.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "791a029f6b9fc27657f6f188ec6e5e43f6911f6f878e0dc5501396e09809d437"
+checksum = "7b5f8eb2ad728638ea2c7d47a21db23b7b58a72ed6a38256b8a1849f15fbbdf7"
 dependencies = [
  "hmac",
 ]
@@ -770,11 +770,11 @@ dependencies = [
 
 [[package]]
 name = "home"
-version = "0.5.5"
+version = "0.5.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5444c27eef6923071f7ebcc33e3444508466a76f7a2b93da00ed6e19f30c1ddb"
+checksum = "e3d1354bf6b7235cb4a0576c2619fd4ed18183f689b12b006a0ee7329eeff9a5"
 dependencies = [
- "windows-sys 0.48.0",
+ "windows-sys 0.52.0",
 ]
 
 [[package]]
@@ -849,18 +849,18 @@ dependencies = [
 
 [[package]]
 name = "itertools"
-version = "0.11.0"
+version = "0.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b1c173a5686ce8bfa551b3563d0c2170bf24ca44da99c7ca4bfdab5418c3fe57"
+checksum = "25db6b064527c5d482d0423354fcd07a89a2dfe07b67892e62411946db7f07b0"
 dependencies = [
  "either",
 ]
 
 [[package]]
 name = "itoa"
-version = "1.0.9"
+version = "1.0.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af150ab688ff2122fcef229be89cb50dd66af9e01a4ff320cc137eecc9bacc38"
+checksum = "b1a46d1a171d865aa5f83f92695765caa047a9b4cbae2cbf37dbd613a793fd4c"
 
 [[package]]
 name = "keccak"
@@ -882,9 +882,9 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.150"
+version = "0.2.151"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "89d92a4743f9a61002fae18374ed11e7973f530cb3a3255fb354818118b2203c"
+checksum = "302d7ab3130588088d277783b1e2d2e10c9e9e4a16dd9050e6ec93fb3e7048f4"
 
 [[package]]
 name = "libm"
@@ -964,9 +964,9 @@ dependencies = [
 
 [[package]]
 name = "mio"
-version = "0.8.9"
+version = "0.8.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3dce281c5e46beae905d4de1870d8b1509a9142b62eedf18b443b011ca8343d0"
+checksum = "8f3d0b296e374a4e6f3c7b0a1f5a51d748a0d34c85e7dc48fc3fa9a87657fe09"
 dependencies = [
  "libc",
  "wasi",
@@ -1133,15 +1133,15 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.18.0"
+version = "1.19.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dd8b5dd2ae5ed71462c540258bedcb51965123ad7e7ccf4b9a8cafaa4a63576d"
+checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
 
 [[package]]
 name = "openssl"
-version = "0.10.60"
+version = "0.10.61"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "79a4c6c3a2b158f7f8f2a2fc5a969fa3a068df6fc9dbb4a43845436e3af7c800"
+checksum = "6b8419dc8cc6d866deb801274bba2e6f8f6108c1bb7fcc10ee5ab864931dbb45"
 dependencies = [
  "bitflags 2.4.1",
  "cfg-if",
@@ -1160,7 +1160,7 @@ checksum = "a948666b637a0f465e8564c73e89d4dde00d72d4d473cc972f390fc3dcee7d9c"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.39",
+ "syn 2.0.41",
 ]
 
 [[package]]
@@ -1171,9 +1171,9 @@ checksum = "ff011a302c396a5197692431fc1948019154afc178baf7d8e37367442a4601cf"
 
 [[package]]
 name = "openssl-sys"
-version = "0.9.96"
+version = "0.9.97"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3812c071ba60da8b5677cc12bcb1d42989a65553772897a7e0355545a819838f"
+checksum = "c3eaad34cdd97d81de97964fc7f29e2d104f483840d906ef56daa1912338460b"
 dependencies = [
  "cc",
  "libc",
@@ -1266,9 +1266,9 @@ checksum = "26072860ba924cbfa98ea39c8c19b4dd6a4a25423dbdf219c1eca91aa0cf6964"
 
 [[package]]
 name = "portable-atomic"
-version = "1.5.1"
+version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3bccab0e7fd7cc19f820a1c8c91720af652d0c88dc9664dd72aef2614f04af3b"
+checksum = "7170ef9988bc169ba16dd36a7fa041e5c4cbeb6a35b76d4c03daded371eae7c0"
 
 [[package]]
 name = "ppv-lite86"
@@ -1400,9 +1400,9 @@ checksum = "d626bb9dae77e28219937af045c257c28bfd3f69333c512553507f5f9798cb76"
 
 [[package]]
 name = "rustix"
-version = "0.38.26"
+version = "0.38.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9470c4bf8246c8daf25f9598dca807fb6510347b1e1cfa55749113850c79d88a"
+checksum = "72e572a5e8ca657d7366229cdde4bd14c4eb5499a9573d4d366fe1b599daa316"
 dependencies = [
  "bitflags 2.4.1",
  "errno",
@@ -1413,9 +1413,9 @@ dependencies = [
 
 [[package]]
 name = "ryu"
-version = "1.0.15"
+version = "1.0.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1ad4cc8da4ef723ed60bced201181d83791ad433213d8c24efffda1eec85d741"
+checksum = "f98d2aa92eebf49b69786be48e4477826b256916e84a57ff2a4f21923b48eb4c"
 
 [[package]]
 name = "schannel"
@@ -1472,7 +1472,7 @@ checksum = "43576ca501357b9b071ac53cdc7da8ef0cbd9493d8df094cd821777ea6e894d3"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.39",
+ "syn 2.0.41",
 ]
 
 [[package]]
@@ -1580,9 +1580,9 @@ dependencies = [
 
 [[package]]
 name = "sqlformat"
-version = "0.2.2"
+version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6b7b278788e7be4d0d29c0f39497a0eef3fba6bbc8e70d8bf7fde46edeaa9e85"
+checksum = "ce81b7bd7c4493975347ef60d8c7e8b742d4694f4c49f93e0a12ea263938176c"
 dependencies = [
  "itertools",
  "nom",
@@ -1822,9 +1822,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.39"
+version = "2.0.41"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "23e78b90f2fcf45d3e842032ce32e3f2d1545ba6636271dcbf24fa306d87be7a"
+checksum = "44c8b28c477cc3bf0e7966561e3460130e1255f7a1cf71931075f1c5e7a7e269"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1867,22 +1867,22 @@ dependencies = [
 
 [[package]]
 name = "thiserror"
-version = "1.0.50"
+version = "1.0.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f9a7210f5c9a7156bb50aa36aed4c95afb51df0df00713949448cf9e97d382d2"
+checksum = "f11c217e1416d6f036b870f14e0413d480dbf28edbee1f877abaf0206af43bb7"
 dependencies = [
  "thiserror-impl",
 ]
 
 [[package]]
 name = "thiserror-impl"
-version = "1.0.50"
+version = "1.0.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "266b2e40bc00e5a6c09c3584011e08b06f123c00362c92b975ba9843aaaa14b8"
+checksum = "01742297787513b79cf8e29d1056ede1313e2420b7b3b15d0a768b4921f549df"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.39",
+ "syn 2.0.41",
 ]
 
 [[package]]
@@ -1902,9 +1902,9 @@ checksum = "1f3ccbac311fea05f86f61904b462b55fb3df8837a366dfc601a0161d0532f20"
 
 [[package]]
 name = "tokio"
-version = "1.35.0"
+version = "1.35.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "841d45b238a16291a4e1584e61820b8ae57d696cc5015c459c229ccc6990cc1c"
+checksum = "c89b4efa943be685f629b149f53829423f8f5531ea21249408e8e2f8671ec104"
 dependencies = [
  "backtrace",
  "bytes",
@@ -1925,7 +1925,7 @@ checksum = "5b8a1e28f2deaa14e508979454cb3a223b10b938b45af148bc0986de36f1923b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.39",
+ "syn 2.0.41",
 ]
 
 [[package]]
@@ -1959,7 +1959,7 @@ checksum = "34704c8d6ebcbc939824180af020566b01a7c01f80641264eba0999f6c2b6be7"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.39",
+ "syn 2.0.41",
 ]
 
 [[package]]
@@ -1979,9 +1979,9 @@ checksum = "42ff0bf0c66b8238c6f3b578df37d0b7848e55df8577b3f74f92a69acceeb825"
 
 [[package]]
 name = "unicode-bidi"
-version = "0.3.13"
+version = "0.3.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "92888ba5573ff080736b3648696b70cafad7d250551175acbaa4e0385b3e1460"
+checksum = "6f2528f27a9eb2b21e69c95319b30bd0efd85d09c379741b0f78ea1d86be2416"
 
 [[package]]
 name = "unicode-ident"
@@ -2300,22 +2300,22 @@ checksum = "dff9641d1cd4be8d1a070daf9e3773c5f67e78b4d9d42263020c057706765c04"
 
 [[package]]
 name = "zerocopy"
-version = "0.7.28"
+version = "0.7.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7d6f15f7ade05d2a4935e34a457b936c23dc70a05cc1d97133dc99e7a3fe0f0e"
+checksum = "1c4061bedbb353041c12f413700357bec76df2c7e2ca8e4df8bac24c6bf68e3d"
 dependencies = [
  "zerocopy-derive",
 ]
 
 [[package]]
 name = "zerocopy-derive"
-version = "0.7.28"
+version = "0.7.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dbbad221e3f78500350ecbd7dfa4e63ef945c05f4c61cb7f4d3f84cd0bba649b"
+checksum = "b3c129550b3e6de3fd0ba67ba5c81818f9805e58b8d7fee80a3a59d2c9fc601a"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.39",
+ "syn 2.0.41",
 ]
 
 [[package]]
diff --git a/src/utils/excel/parser.rs b/src/utils/excel/parser.rs
index fe1b5f6..512ee58 100644
--- a/src/utils/excel/parser.rs
+++ b/src/utils/excel/parser.rs
@@ -1,31 +1,22 @@
 use super::{Excel, Parser};
 
-impl Parser for Excel {
-    fn parse_lecturer(&self, row: u32, col: u32) -> Option<Vec<&str>> {
-        self.range
-            .get_value((row + 1, col))
-            .and_then(|cell| cell.get_string())
-            .map(|lecturer| {
-                lecturer
-                    .split('/')
-                    .nth(2)
-                    .unwrap_or_default()
-                    .split('-')
-                    .collect()
-            })
+impl<'a> Parser<'a> for Excel {
+    fn parse_lecturer(class_detail_str: &'a str) -> Option<Vec<&'a str>> {
+        let lecturers: Vec<&str> = class_detail_str
+            .split('/')
+            .nth(2)?
+            .split('-')
+            .map(|lec| lec.trim())
+            .collect();
+        if lecturers.is_empty() {
+            None
+        } else {
+            Some(lecturers)
+        }
     }
 
-    fn parse_session(&self, row_idx: u32) -> Option<String> {
-        self.range
-            .get_value((row_idx, 1))
-            .and_then(|cell| cell.get_string())
-            .map(|session_str| {
-                session_str
-                    .split(" - ")
-                    .next()
-                    .unwrap_or_default()
-                    .to_string()
-            })
+    fn parse_session(session_str: &str) -> Option<String> {
+        session_str.split(" - ").next().map(|s| s.to_string())
     }
 
     fn parse_subject_with_code_2(val: &str) -> Option<(String, String)> {
@@ -185,4 +176,68 @@ mod tests {
             );
         });
     }
+
+    #[test]
+    fn test_parse_lecturer_from_class_detail() {
+        struct TestCase<'a> {
+            class_detail: String,
+            lecturers: Vec<&'a str>,
+        }
+        let test_cases: Vec<TestCase> = vec![
+            TestCase {
+                class_detail: String::from("2 sks/ Sem 7 / AM - WN"),
+                lecturers: vec!["AM", "WN"],
+            },
+            TestCase {
+                class_detail: String::from("4 sks / Sem 2 / CF"),
+                lecturers: vec!["CF"],
+            },
+            TestCase {
+                class_detail: String::from("3 sks / Sem 1 / DH"),
+                lecturers: vec!["DH"],
+            },
+            TestCase {
+                class_detail: String::from("3 sks / Sem 1 / DO"),
+                lecturers: vec!["DO"],
+            },
+            TestCase {
+                class_detail: String::from("3 sks / Sem 5 / BS"),
+                lecturers: vec!["BS"],
+            },
+        ];
+
+        test_cases.into_iter().for_each(|test| {
+            assert_eq!(
+                Excel::parse_lecturer(&test.class_detail),
+                Some(test.lecturers)
+            )
+        });
+    }
+
+    #[test]
+    fn test_parse_session() {
+        struct TestCase {
+            session_str: String,
+            session_start: Option<String>,
+        }
+
+        let test_cases: Vec<TestCase> = vec![
+            TestCase {
+                session_str: String::from("08.00 - 09.00"),
+                session_start: Some(String::from("08.00")),
+            },
+            TestCase {
+                session_str: String::from("17.00 - 18.00"),
+                session_start: Some(String::from("17.00")),
+            },
+            TestCase {
+                session_str: String::from("10.00 - 11.00"),
+                session_start: Some(String::from("10.00")),
+            },
+        ];
+
+        test_cases.into_iter().for_each(|test| {
+            assert_eq!(Excel::parse_session(&test.session_str), test.session_start)
+        })
+    }
 }