This is a homemade Linux code shell

Completed task:

• Handle missing command
• REPL (Read-Eval-Print Loop)
• Exit builtin
• Echo builtin
• Type builtin
• Type builtin check for executable files
• run a program in one of the PATH directory
• pwd command
• cd command
• ls command

How to run program:

• download CMake
• download vcpkg
• make sure that the vcpkg/scripts/buildsystems/vcpkg.cmake file is in the same folder with code_shell_homemade
• make sure to change the path in /build/CMakeCache.txt by replacing INSERT_USER_NAME_HERE
• make sure to fix the path of your vcpkg in your_shell.sh
• Run ./your_shell.sh to run your program, which is implemented in src/main.cpp.