Problem with Assembly code for Linux 64

I've created a very simple 64-bit GNU Asssembly Linux code and it works. Except that after the strip it stops working. What could be happening?

Start the code

.section    .rodata

clear:
    .ascii "3c
.section    .rodata

clear:
    .ascii "3c%pre%"

size:
    .int . -clear       

.section    .text           
.globl _start           

_start:

_zera:

    xorq        %rax,   %rax
    xorq        %rdi,       %rdi
    xorq        %rsi,       %rsi
    xorq        %rdx,   %rdx

_apaga:

    movq    $1, %rax 
    movq    $1, %rdi
    movq    $clear, %rsi
    movq    size,   %rdx
    syscall

_fim:
    movq    $60,    %rax
    movq    $0,     %rdi
    syscall
"

size:
    .int . -clear       

.section    .text           
.globl _start           

_start:

_zera:

    xorq        %rax,   %rax
    xorq        %rdi,       %rdi
    xorq        %rsi,       %rsi
    xorq        %rdx,   %rdx

_apaga:

    movq    $1, %rax 
    movq    $1, %rdi
    movq    $clear, %rsi
    movq    size,   %rdx
    syscall

_fim:
    movq    $60,    %rax
    movq    $0,     %rdi
    syscall

Thank you in advance.