cmake with multiple c files and header files - c

Question

I have some trouble in using cmake.
I have five files as below.
list.c
list.h
spooky-c.c
spooky-c.h
main.c
And
list.c #includes list.h
spooky-c.c #includes spooky-c.h
main.c #includes spooky-c.c and list.c
I tried to make CMakeLists.txt as follows
cmake_minimum_required(VERSION 3.0)
project(Project_1 C)
set(CMAKE_C_STANDARD 99)
include_directories(include)
file(GLOB SOURCES "src/*.c")
add_executable(Project_1 ${SOURCES})
with following directory structure
list.h and spooky-c.h are in include/ folder
list.c, spooky-c.c, main.c are in src/ folder
But make doesn't work.
How should the CMakeLists.txt look like?
With the help of #Someprogrammerdude, I changed main.c to #include list.h and spooky-c.h.
cmake works as follows
(base) joo#joo:~/CLionProjects/Advanced_Programming/Project_1 (copy)/build$ cmake ..
-- The C compiler identification is GNU 7.4.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Configuring done
-- Generating done
-- Build files have been written to: /home/joo/CLionProjects/Advanced_Programming/Project_1 (copy)/build
But following error occurs.
(base) joo#joo:~/CLionProjects/Advanced_Programming/Project_1 (copy)/build$ make
Scanning dependencies of target Project_1
[ 33%] Building C object CMakeFiles/Project_1.dir/src/list.c.o
[ 66%] Building C object CMakeFiles/Project_1.dir/src/spooky-c.c.o
[100%] Linking C executable Project_1
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/Scrt1.o: In function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
CMakeFiles/Project_1.dir/build.make:120: recipe for target 'Project_1' failed
make[2]: *** [Project_1] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/Project_1.dir/all' failed
make[1]: *** [CMakeFiles/Project_1.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2
#Someprogrammerdude
Thank you. I forgot to move main.c to src folder.
Now it works.