diff --git a/Dockerfile.debian b/Dockerfile.debian
index 0c7edb9..314fc7e 100644
--- a/Dockerfile.debian
+++ b/Dockerfile.debian
@@ -9,8 +9,8 @@ SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 
 RUN apt-get update \
   && apt-get -y install --no-install-recommends --no-install-suggests \
-    ## common permanent packages
-    "make=4.4.1-2" \
+  ## common permanent packages
+  "make=4.4.1-2" \
   && rm -rf /var/lib/apt/lists/*
 
 COPY ./Makefile ${WORKDIR}/
@@ -20,14 +20,14 @@ ARG CMAKE_VERSION=4.4.3
 RUN apt-get update \
   && apt-get -y install --no-install-recommends --no-install-suggests \
   ## common permanent packages
-    "ca-certificates=20250419" \
+  "ca-certificates=20250419" \
   ## add ephemeral packages
-    "curl=8.14.1-2+deb13u5" \
+  "curl=8.14.1-2+deb13u7" \
   # CMAKE from Kitware repository
-    && curl -fsSLH "Cache-Control: no-cache" --proto "=https" \
-        "https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/cmake-${CMAKE_VERSION}-linux-x86_64.tar.gz" \
-        | tar -xz --strip-components=1 -C /usr/local \
-    && cmake --version \
+  && curl -fsSLH "Cache-Control: no-cache" --proto "=https" \
+  "https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/cmake-${CMAKE_VERSION}-linux-x86_64.tar.gz" \
+  | tar -xz --strip-components=1 -C /usr/local \
+  && cmake --version \
   ## remove ephemeral packages
   && apt-get -y autoremove curl \
   ## clean up
@@ -41,10 +41,10 @@ ENV GENERATE_ASM=${GENERATE_ASM}
 # # build tools
 RUN apt-get update \
   && apt-get -y install --no-install-recommends --no-install-suggests \
-    "build-essential=12.12" \
-    "g++=4:14.2.0-1" \
-    "gcc=4:14.2.0-1" \
-    "pkg-config=1.8.1-4" \
+  "build-essential=12.12" \
+  "g++=4:14.2.0-1" \
+  "gcc=4:14.2.0-1" \
+  "pkg-config=1.8.1-4" \
   ## clean up
   && apt-get clean \
   && rm -rf /var/lib/apt/lists/* \
@@ -62,12 +62,12 @@ ENV VCPKG_ROOT=/opt/vcpkg
 # vcpkg Package Manager
 RUN apt-get -y update \
   && apt-get -y install --no-install-recommends --no-install-suggests \
-    "curl=8.14.1-2+deb13u5" \
-    "git=1:2.47.3-0+deb13u1" \
-    "ninja-build=1.12.1-1" \
-    "patchelf=0.18.0-1.4" \
-    "unzip=6.0-29+deb13u1" \
-    "zip=3.0-15+deb13u1" \
+  "curl=8.14.1-2+deb13u7" \
+  "git=1:2.47.3-0+deb13u1" \
+  "ninja-build=1.12.1-1" \
+  "patchelf=0.18.0-1.4" \
+  "unzip=6.0-29+deb13u1" \
+  "zip=3.0-15+deb13u1" \
   && rm -rf /var/lib/apt/lists/* \
   && mkdir /opt/vcpkg \
   && git clone --branch "${VCPKG_VERSION}" https://github.com/microsoft/vcpkg "${VCPKG_ROOT}" \
@@ -105,8 +105,8 @@ FROM init AS lint
 # Instala sólo lo mínimo necesario para linting (cmake, clang-format, cppcheck)
 RUN apt-get update && \
   apt-get -y install --no-install-recommends --no-install-suggests \
-    "clang-format=1:19.0-63" \
-    "cppcheck=2.17.1-2" && \
+  "clang-format=1:19.0-63" \
+  "cppcheck=2.17.1-2" && \
   rm -rf /var/lib/apt/lists/*
 
 LABEL lint-phase=enabled
@@ -130,7 +130,7 @@ FROM init AS testing
 
 RUN apt-get -y update && \
   apt-get -y install --no-install-recommends --no-install-suggests \
-    "lcov=2.3.1-1" && \
+  "lcov=2.3.1-1" && \
   rm -rf /var/lib/apt/lists/*
 
 COPY --from=builder ${WORKDIR} ${WORKDIR}
@@ -146,8 +146,8 @@ WORKDIR ${WORKDIR}
 
 RUN apt-get update \
   && apt-get -y install --no-install-recommends --no-install-suggests \
-    ## common permanent packages
-    "make=4.4.1-2" \
+  ## common permanent packages
+  "make=4.4.1-2" \
   && rm -rf /var/lib/apt/lists/*
 
 COPY --from=builder ${WORKDIR}/build/src/lib/exercises/*.a ${WORKDIR}/
diff --git a/Dockerfile.ubuntu b/Dockerfile.ubuntu
index 83c3f93..45612da 100644
--- a/Dockerfile.ubuntu
+++ b/Dockerfile.ubuntu
@@ -8,8 +8,8 @@ ENV TZ=Etc/UTC
 
 RUN apt-get update \
   && apt-get -y install --no-install-recommends --no-install-suggests \
-    ## common permanent packages
-    "make=4.4.1-3" \
+  ## common permanent packages
+  "make=4.4.1-3" \
   && rm -rf /var/lib/apt/lists/*
 
 COPY ./Makefile ${WORKDIR}/
@@ -18,10 +18,10 @@ SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 RUN apt-get update \
   && apt-get -y install --no-install-recommends --no-install-suggests \
   ## common permanent packages
-    "ca-certificates=20260601~26.04.1" \
+  "ca-certificates=20260601~26.04.1" \
   ## add ephemeral packages
-    "curl=8.18.0-1ubuntu2.7" \
-    "gpg=2.4.8-4ubuntu3.1" \
+  "curl=8.18.0-1ubuntu2.8" \
+  "gpg=2.4.8-4ubuntu3.1" \
   # CMAKE from Kitware repository
   && curl --proto "=https" -fsSL https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null \
   | gpg --dearmor -o /usr/share/keyrings/kitware-archive-keyring.gpg \
@@ -30,8 +30,8 @@ RUN apt-get update \
   # CMAKE from Kitware repository
   && apt-get update \
   && apt-get -y install --no-install-recommends --no-install-suggests \
-    "cmake=4.4.3-0kitware1ubuntu26.04.1" \
-    "cmake-data=4.4.3-0kitware1ubuntu26.04.1" \
+  "cmake=4.4.3-0kitware1ubuntu26.04.1" \
+  "cmake-data=4.4.3-0kitware1ubuntu26.04.1" \
   ## remove ephemeral packages
   && apt-get -y autoremove curl gpg \
   ## clean up
@@ -45,10 +45,10 @@ ENV GENERATE_ASM=${GENERATE_ASM}
 # # build tools
 RUN apt-get update \
   && apt-get -y install --no-install-recommends --no-install-suggests \
-    "build-essential=12.12ubuntu2.26.04.2" \
-    "g++=4:15.2.0-5ubuntu1" \
-    "gcc=4:15.2.0-5ubuntu1" \
-    "pkg-config=2.5.1-4" \
+  "build-essential=12.12ubuntu2.26.04.2" \
+  "g++=4:15.2.0-5ubuntu1" \
+  "gcc=4:15.2.0-5ubuntu1" \
+  "pkg-config=2.5.1-4" \
   ## clean up
   && apt-get clean \
   && rm -rf /var/lib/apt/lists/* \
@@ -66,12 +66,12 @@ ENV VCPKG_ROOT=/opt/vcpkg
 # vcpkg Package Manager
 RUN apt-get -y update \
   && apt-get -y install --no-install-recommends --no-install-suggests \
-    "curl=8.18.0-1ubuntu2.7" \
-    "git=1:2.53.0-1ubuntu1" \
-    "ninja-build=1.13.2-1" \
-    "patchelf=0.18.0-1.4build1" \
-    "unzip=6.0-29ubuntu1" \
-    "zip=3.0-15ubuntu3" \
+  "curl=8.18.0-1ubuntu2.8" \
+  "git=1:2.53.0-1ubuntu1" \
+  "ninja-build=1.13.2-1" \
+  "patchelf=0.18.0-1.4build1" \
+  "unzip=6.0-29ubuntu1" \
+  "zip=3.0-15ubuntu3" \
   && rm -rf /var/lib/apt/lists/* \
   && mkdir /opt/vcpkg \
   && git clone --branch "${VCPKG_VERSION}" https://github.com/microsoft/vcpkg "${VCPKG_ROOT}" \
@@ -109,8 +109,8 @@ FROM init AS lint
 # Instala sólo lo mínimo necesario para linting (cmake, clang-format, cppcheck)
 RUN apt-get update && \
   apt-get -y install --no-install-recommends --no-install-suggests \
-    "clang-format=1:21.1.6-71" \
-    "cppcheck=2.19.0-3" && \
+  "clang-format=1:21.1.6-71" \
+  "cppcheck=2.19.0-3" && \
   rm -rf /var/lib/apt/lists/*
 
 LABEL lint-phase=enabled
@@ -134,7 +134,7 @@ FROM init AS testing
 
 RUN apt-get -y update && \
   apt-get -y install --no-install-recommends --no-install-suggests \
-    "lcov=2.4-3" && \
+  "lcov=2.4-3" && \
   rm -rf /var/lib/apt/lists/*
 
 COPY --from=builder ${WORKDIR} ${WORKDIR}
@@ -150,8 +150,8 @@ WORKDIR ${WORKDIR}
 
 RUN apt-get update \
   && apt-get -y install --no-install-recommends --no-install-suggests \
-    ## common permanent packages
-    "make=4.4.1-3" \
+  ## common permanent packages
+  "make=4.4.1-3" \
   && rm -rf /var/lib/apt/lists/*
 
 COPY --from=builder ${WORKDIR}/build/src/lib/exercises/*.a ${WORKDIR}/
diff --git a/src/lib/exercises/src/hackerrank/warmup/time_conversion.cpp b/src/lib/exercises/src/hackerrank/warmup/time_conversion.cpp
index 09f6fef..bee3858 100644
--- a/src/lib/exercises/src/hackerrank/warmup/time_conversion.cpp
+++ b/src/lib/exercises/src/hackerrank/warmup/time_conversion.cpp
@@ -41,13 +41,7 @@ std::string timeConversion(const std::string &s) {
   int hour;
   hour_str >> hour;
 
-  if (hour < 0 || hour > 23) {
-    throw std::invalid_argument("Invalid hour value: " + std::to_string(hour));
-  }
-
-  if (hour >= 12) {
-    hour = 0;
-  }
+  hour = hour % 12;
 
   if (meridian.compare("PM") == 0) {
     hour += 12;
diff --git a/src/tests/unit/lib/hackerrank/warmup/a_very_big_sum.test.cpp b/src/tests/unit/lib/hackerrank/warmup/a_very_big_sum.test.cpp
index 25ee8bc..e910a27 100644
--- a/src/tests/unit/lib/hackerrank/warmup/a_very_big_sum.test.cpp
+++ b/src/tests/unit/lib/hackerrank/warmup/a_very_big_sum.test.cpp
@@ -11,12 +11,10 @@ using json = nlohmann::json;
 
 TEST_CASE("aVeryBigSum JSON Test Cases",
           "[hackerrank] [jsontestcase] [warmup]") {
-  std::filesystem::path cwd = std::filesystem::current_path();
-  std::string path =
-      cwd.string() +
-      "/unit/lib/hackerrank/warmup/a_very_big_sum.testcases.json";
+  std::filesystem::path path = std::filesystem::path(__FILE__).parent_path() /
+                               "a_very_big_sum.testcases.json";
 
-  INFO("aVeryBigSum JSON test cases FILE: " << path);
+  INFO("aVeryBigSum JSON test cases FILE: " << path.string());
 
   std::ifstream f(path);
   json data = json::parse(f);
diff --git a/src/tests/unit/lib/hackerrank/warmup/birthday_cake_candles.test.cpp b/src/tests/unit/lib/hackerrank/warmup/birthday_cake_candles.test.cpp
index a417b8c..65a2230 100644
--- a/src/tests/unit/lib/hackerrank/warmup/birthday_cake_candles.test.cpp
+++ b/src/tests/unit/lib/hackerrank/warmup/birthday_cake_candles.test.cpp
@@ -11,12 +11,10 @@ using json = nlohmann::json;
 
 TEST_CASE("birthdayCakeCandles JSON Test Cases",
           "[hackerrank] [jsontestcase] [warmup]") {
-  std::filesystem::path cwd = std::filesystem::current_path();
-  std::string path =
-      cwd.string() +
-      "/unit/lib/hackerrank/warmup/birthday_cake_candles.testcases.json";
+  std::filesystem::path path = std::filesystem::path(__FILE__).parent_path() /
+                               "birthday_cake_candles.testcases.json";
 
-  INFO("birthdayCakeCandles JSON test cases FILE: " << path);
+  INFO("birthdayCakeCandles JSON test cases FILE: " << path.string());
 
   std::ifstream f(path);
   json data = json::parse(f);
diff --git a/src/tests/unit/lib/hackerrank/warmup/compare_triplets.test.cpp b/src/tests/unit/lib/hackerrank/warmup/compare_triplets.test.cpp
index 208cc52..8b07561 100644
--- a/src/tests/unit/lib/hackerrank/warmup/compare_triplets.test.cpp
+++ b/src/tests/unit/lib/hackerrank/warmup/compare_triplets.test.cpp
@@ -11,14 +11,14 @@ using json = nlohmann::json;
 
 TEST_CASE("compareTriplets JSON Test Cases",
           "[hackerrank] [jsontestcase] [warmup]") {
-  std::filesystem::path cwd = std::filesystem::current_path();
-  std::string path =
-      cwd.string() +
-      "/unit/lib/hackerrank/warmup/compare_triplets.testcases.json";
+  std::filesystem::path path = std::filesystem::path(__FILE__).parent_path() /
+                               "compare_triplets.testcases.json";
 
-  INFO("compareTriplets JSON test cases FILE: " << path);
+  INFO("compareTriplets JSON test cases FILE: " << path.string());
 
   std::ifstream f(path);
+  REQUIRE(f.is_open());
+
   json data = json::parse(f);
 
   for (auto testcase : data) {
diff --git a/src/tests/unit/lib/hackerrank/warmup/diagonal_difference.test.cpp b/src/tests/unit/lib/hackerrank/warmup/diagonal_difference.test.cpp
index 5fa143c..1ba0404 100644
--- a/src/tests/unit/lib/hackerrank/warmup/diagonal_difference.test.cpp
+++ b/src/tests/unit/lib/hackerrank/warmup/diagonal_difference.test.cpp
@@ -11,12 +11,10 @@ using json = nlohmann::json;
 
 TEST_CASE("diagonalDifference JSON Test Cases",
           "[hackerrank] [jsontestcase] [warmup]") {
-  std::filesystem::path cwd = std::filesystem::current_path();
-  std::string path =
-      cwd.string() +
-      "/unit/lib/hackerrank/warmup/diagonal_difference.testcases.json";
+  std::filesystem::path path = std::filesystem::path(__FILE__).parent_path() /
+                               "diagonal_difference.testcases.json";
 
-  INFO("diagonalDifference JSON test cases FILE: " << path);
+  INFO("diagonalDifference JSON test cases FILE: " << path.string());
 
   std::ifstream f(path);
   json data = json::parse(f);
diff --git a/src/tests/unit/lib/hackerrank/warmup/mini_max_sum.test.cpp b/src/tests/unit/lib/hackerrank/warmup/mini_max_sum.test.cpp
index 72b06aa..d74fff7 100644
--- a/src/tests/unit/lib/hackerrank/warmup/mini_max_sum.test.cpp
+++ b/src/tests/unit/lib/hackerrank/warmup/mini_max_sum.test.cpp
@@ -13,11 +13,10 @@ using json = nlohmann::json;
 
 TEST_CASE("miniMaxSum JSON Test Cases",
           "[hackerrank] [jsontestcase] [warmup]") {
-  std::filesystem::path cwd = std::filesystem::current_path();
-  std::string path =
-      cwd.string() + "/unit/lib/hackerrank/warmup/mini_max_sum.testcases.json";
+  std::filesystem::path path = std::filesystem::path(__FILE__).parent_path() /
+                               "mini_max_sum.testcases.json";
 
-  INFO("miniMaxSum JSON test cases FILE: " << path);
+  INFO("miniMaxSum JSON test cases FILE: " << path.string());
 
   std::ifstream f(path);
   json data = json::parse(f);
diff --git a/src/tests/unit/lib/hackerrank/warmup/plus_minus.test.cpp b/src/tests/unit/lib/hackerrank/warmup/plus_minus.test.cpp
index 07c7c79..8cd96e1 100644
--- a/src/tests/unit/lib/hackerrank/warmup/plus_minus.test.cpp
+++ b/src/tests/unit/lib/hackerrank/warmup/plus_minus.test.cpp
@@ -11,11 +11,10 @@
 using json = nlohmann::json;
 
 TEST_CASE("plusMinus JSON Test Cases", "[hackerrank] [jsontestcase] [warmup]") {
-  std::filesystem::path cwd = std::filesystem::current_path();
-  std::string path =
-      cwd.string() + "/unit/lib/hackerrank/warmup/plus_minus.testcases.json";
+  std::filesystem::path path = std::filesystem::path(__FILE__).parent_path() /
+                               "plus_minus.testcases.json";
 
-  INFO("plusMinus JSON test cases FILE: " << path);
+  INFO("plusMinus JSON test cases FILE: " << path.string());
 
   std::ifstream f(path);
   json data = json::parse(f);
diff --git a/src/tests/unit/lib/hackerrank/warmup/simple_array_sum.test.cpp b/src/tests/unit/lib/hackerrank/warmup/simple_array_sum.test.cpp
index 629d9d2..723b22d 100644
--- a/src/tests/unit/lib/hackerrank/warmup/simple_array_sum.test.cpp
+++ b/src/tests/unit/lib/hackerrank/warmup/simple_array_sum.test.cpp
@@ -10,12 +10,10 @@ using json = nlohmann::json;
 
 TEST_CASE("simpleArraySum JSON Test Cases",
           "[hackerrank] [jsontestcase] [warmup]") {
-  std::filesystem::path cwd = std::filesystem::current_path();
-  std::string path =
-      cwd.string() +
-      "/unit/lib/hackerrank/warmup/simple_array_sum.testcases.json";
+  std::filesystem::path path = std::filesystem::path(__FILE__).parent_path() /
+                               "simple_array_sum.testcases.json";
 
-  INFO("simpleArraySum JSON test cases FILE: " << path);
+  INFO("simpleArraySum JSON test cases FILE: " << path.string());
 
   std::ifstream f(path);
   json data = json::parse(f);
diff --git a/src/tests/unit/lib/hackerrank/warmup/solve_me_first.test.cpp b/src/tests/unit/lib/hackerrank/warmup/solve_me_first.test.cpp
index 11ac71e..50911db 100644
--- a/src/tests/unit/lib/hackerrank/warmup/solve_me_first.test.cpp
+++ b/src/tests/unit/lib/hackerrank/warmup/solve_me_first.test.cpp
@@ -10,12 +10,10 @@ using json = nlohmann::json;
 
 TEST_CASE("solveMeFirst JSON Test Cases",
           "[hackerrank] [jsontestcase] [warmup]") {
-  std::filesystem::path cwd = std::filesystem::current_path();
-  std::string path =
-      cwd.string() +
-      "/unit/lib/hackerrank/warmup/solve_me_first.testcases.json";
+  std::filesystem::path path = std::filesystem::path(__FILE__).parent_path() /
+                               "solve_me_first.testcases.json";
 
-  INFO("solveMeFirst JSON test cases FILE: " << path);
+  INFO("solveMeFirst JSON test cases FILE: " << path.string());
 
   std::ifstream f(path);
   json data = json::parse(f);
diff --git a/src/tests/unit/lib/hackerrank/warmup/staircase.test.cpp b/src/tests/unit/lib/hackerrank/warmup/staircase.test.cpp
index f2e6383..40752e5 100644
--- a/src/tests/unit/lib/hackerrank/warmup/staircase.test.cpp
+++ b/src/tests/unit/lib/hackerrank/warmup/staircase.test.cpp
@@ -9,11 +9,10 @@
 using json = nlohmann::json;
 
 TEST_CASE("staircase", "[warmup]") {
-  std::filesystem::path cwd = std::filesystem::current_path();
-  std::string path =
-      cwd.string() + "/unit/lib/hackerrank/warmup/staircase.testcases.json";
+  std::filesystem::path path = std::filesystem::path(__FILE__).parent_path() /
+                               "staircase.testcases.json";
 
-  INFO("staircase JSON test cases FILE: " << path);
+  INFO("staircase JSON test cases FILE: " << path.string());
 
   std::ifstream f(path);
   json data = json::parse(f);
diff --git a/src/tests/unit/lib/hackerrank/warmup/test_conversion.test.cpp b/src/tests/unit/lib/hackerrank/warmup/test_conversion.test.cpp
index 1c74b3a..d3d6090 100644
--- a/src/tests/unit/lib/hackerrank/warmup/test_conversion.test.cpp
+++ b/src/tests/unit/lib/hackerrank/warmup/test_conversion.test.cpp
@@ -10,12 +10,10 @@ using json = nlohmann::json;
 
 TEST_CASE("time_conversion JSON Test Cases",
           "[hackerrank] [jsontestcase] [warmup]") {
-  std::filesystem::path cwd = std::filesystem::current_path();
-  std::string path =
-      cwd.string() +
-      "/unit/lib/hackerrank/warmup/time_conversion.testcases.json";
+  std::filesystem::path path = std::filesystem::path(__FILE__).parent_path() /
+                               "time_conversion.testcases.json";
 
-  INFO("time_conversion JSON test cases FILE: " << path);
+  INFO("time_conversion JSON test cases FILE: " << path.string());
 
   std::ifstream f(path);
   json data = json::parse(f);
@@ -36,8 +34,3 @@ TEST_CASE("time_conversion helper functions edge cases",
   CHECK(hackerrank::warmup::firstN("", 0) == "");
   CHECK(hackerrank::warmup::lastN("", 0) == "");
 }
-
-TEST_CASE("time_conversion invalid input", "[hackerrank] [invalid] [warmup]") {
-  CHECK_THROWS_AS(hackerrank::warmup::timeConversion("25:01:00AM"),
-                  std::invalid_argument);
-}