Does necessary content of same header will be duplicated in produced executable?

Question

I use gcc. We know the cpp expands all macros definitions and include statements and passes the result to the actual compiler to create an executable file. I tested the result of cpp and see that some parts of header which are necessary, are included in output of cpp for each source file.

But I want to know if in a project I have a header that is included in multiple source files, then does the related content to that header will be duplicated multiple times in produced executable? Or there will be multiple shortcuts to them? If there will be shortcuts, I want to know why cpp replaces shortcuts of source files with more code and pass the result to cc1?

For example in a header, I have a function with name kids

int kids(){
  return 1;
}

and call it in test.c source file. The cpp puts the definition of kids in its output. But in compiled file (test.s which is the result of cc -S test.c), I only see call kids which is replaced instead of function definition. I call that a shortcut.I want to know what will happen for that function and its calls in executable?

Edit:

The assembly off test.c is:

    .file   "test.c"
    .text
    .globl  kids
    .type   kids, @function
kids:
.LFB0:
    .cfi_startproc
    endbr64
    pushq   %rbp
    .cfi_def_cfa_offset 16
    .cfi_offset 6, -16
    movq    %rsp, %rbp
    .cfi_def_cfa_register 6
    movl    $1, %eax
    popq    %rbp
    .cfi_def_cfa 7, 8
    ret
    .cfi_endproc
.LFE0:
    .size   kids, .-kids
    .section    .rodata
.LC0:
    .string "C Rocks + Ali!"
.LC1:
    .string "%d"
    .text
    .globl  main
    .type   main, @function
main:
.LFB1:
    .cfi_startproc
    endbr64
    pushq   %rbp
    .cfi_def_cfa_offset 16
    .cfi_offset 6, -16
    movq    %rsp, %rbp
    .cfi_def_cfa_register 6
    leaq    .LC0(%rip), %rdi
    call    puts@PLT
    movl    $0, %eax
    call    kids
    movl    %eax, %esi
    leaq    .LC1(%rip), %rdi
    movl    $0, %eax
    call    printf@PLT
    movl    $0, %eax
    popq    %rbp
    .cfi_def_cfa 7, 8
    ret
    .cfi_endproc
.LFE1:
    .size   main, .-main
    .ident  "GCC: (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0"
    .section    .note.GNU-stack,"",@progbits
    .section    .note.gnu.property,"a"
    .align 8
    .long    1f - 0f
    .long    4f - 1f
    .long    5
0:
    .string  "GNU"
1:
    .align 8
    .long    0xc0000002
    .long    3f - 2f
2:
    .long    0x3
3:
    .align 8
4: