Redirect exe files into bin directory

Hi! I have a project that as 2 sub folders. One is Leetcode which just has a bunch of C++ files. They all compile and run but one annoying thing is that CMAKELIST.TXT creates exe files for each c++ source files when it builds and run.

It can get very long because I just have many C+++ source files. 

Im trying to redirect these exe files into a bin folder under LeetCode by editing my CMakeList.txt but it's not working

This is what my project structure looks like: 

CMakeList.txt

cmake_minimum_required(VERSION 3.27)
project(Coding_Challanges)

set(CMAKE_CXX_STANDARD 17)

function(add_leetcode_executable name)
    add_executable(${name} LeetCode/${name}.cpp)
    set_target_properties(${name} PROPERTIES
            RUNTIME_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/bin/LeetCode
    )
endfunction()

add_subdirectory(LeetCode/Hello)
add_leetcode_executable(assignCookies)