diff --git a/.github/workflows/cpplint_modified_files.yml b/.github/workflows/cpplint_modified_files.yml
index 07a32ece9..8de6a5e41 100644
--- a/.github/workflows/cpplint_modified_files.yml
+++ b/.github/workflows/cpplint_modified_files.yml
@@ -11,7 +11,7 @@ jobs:
   cpplint_modified_files:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v1  # v2 is broken for git diff
+      - uses: actions/checkout@v1 # v2 is broken for git diff
       - uses: actions/setup-python@v1
       - run: python -m pip install cpplint
       - run: git remote -v
@@ -42,7 +42,8 @@ jobs:
           print("g++:")
           # compile_exts = tuple(".c .c++ .cc .cpp .cu .cxx".split())
           # compile_files = [file for file in cpp_files if file.lower().endswith(compile_exts)]
-          subprocess.run(["g++"] + cpp_files, check=True, text=True)
+          for cpp_file in cpp_files:
+            subprocess.run(["g++", cpp_file], check=True, text=True)
 
           upper_files = [file for file in cpp_files if file != file.lower()]
           if upper_files:
diff --git a/DIRECTORY.md b/DIRECTORY.md
index 26210d6d4..9e163d414 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -11,8 +11,8 @@
 
 ## Computer Oriented Statistical Methods
   * [Bisection Method](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/computer_oriented_statistical_methods/bisection_method.cpp)
-  * [False-Position](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/computer_oriented_statistical_methods/false-position.cpp)
-  * [Gaussian Elimination](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/computer_oriented_statistical_methods/Gaussian_elimination.cpp)
+  * [False Position](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/computer_oriented_statistical_methods/false_position.cpp)
+  * [Gaussian Elimination](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/computer_oriented_statistical_methods/gaussian_elimination.cpp)
   * [Newton Raphson Method](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/computer_oriented_statistical_methods/newton_raphson_method.cpp)
   * [Ordinary Least Squares Regressor](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/computer_oriented_statistical_methods/ordinary_least_squares_regressor.cpp)
   * [Secant Method](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/computer_oriented_statistical_methods/secant_method.cpp)
@@ -132,13 +132,13 @@
   * [Union Of 2 Arrays](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/operations_on_datastructures/Union_of_2_arrays.cpp)
 
 ## Others
-  * [Buzz Number](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/others/Buzz_number.cpp)
+  * [Buzz Number](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/others/buzz_number.cpp)
   * [Decimal To Binary](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/others/decimal_to_binary.cpp)
   * [Decimal To Hexadecimal](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/others/decimal_to_hexadecimal.cpp)
   * [Decimal To Roman Numeral](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/others/decimal_to_roman_numeral.cpp)
   * [Fast Interger Input](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/others/fast_interger_input.cpp)
   * [Fibonacci Fast](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/others/fibonacci_fast.cpp)
-  * [Gcd Of N Numbers](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/others/GCD_of_n_numbers.cpp)
+  * [Gcd Of N Numbers](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/others/gcd_of_n_numbers.cpp)
   * [Happy Number](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/others/happy_number.cpp)
   * [Matrix Exponentiation](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/others/matrix_exponentiation.cpp)
   * [Measure Time Elapsed](https://github.com/TheAlgorithms/C-Plus-Plus/blob/master/others/measure_time_elapsed.cpp)
diff --git a/computer_oriented_statistical_methods/false-position.cpp b/computer_oriented_statistical_methods/false_position.cpp
similarity index 100%
rename from computer_oriented_statistical_methods/false-position.cpp
rename to computer_oriented_statistical_methods/false_position.cpp
diff --git a/computer_oriented_statistical_methods/Gaussian_elimination.cpp b/computer_oriented_statistical_methods/gaussian_elimination.cpp
similarity index 100%
rename from computer_oriented_statistical_methods/Gaussian_elimination.cpp
rename to computer_oriented_statistical_methods/gaussian_elimination.cpp
diff --git a/others/Buzz_number.cpp b/others/buzz_number.cpp
similarity index 100%
rename from others/Buzz_number.cpp
rename to others/buzz_number.cpp
diff --git a/others/GCD_of_n_numbers.cpp b/others/gcd_of_n_numbers.cpp
similarity index 100%
rename from others/GCD_of_n_numbers.cpp
rename to others/gcd_of_n_numbers.cpp