Given the following C code and unoptimized assembly code, your task is to generate highly optimized x86-64 assembly code.
C Code:

```c
#include<stdio.h>
#include<string.h>
int main(void){
  char str[222];
  scanf("%s",str);
  int n=strlen(str);
  for(int loop=n-2;loop;loop-=2){
    if(strncmp(str,str+loop/2,loop/2)==0){
      printf("%d\n",loop);
      return 0;
    }
  }
  return 0;
}```

Unoptimized Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.section	.rodata
.LC0:
	.string	"%s"
.LC1:
	.string	"%d\n"
	.text
	.globl	main
	.type	main, @function
main:
.LFB0:
	.cfi_startproc
	endbr64
	pushq	%rbp
	.cfi_def_cfa_offset 16
	.cfi_offset 6, -16
	movq	%rsp, %rbp
	.cfi_def_cfa_register 6
	subq	$256, %rsp
	movq	%fs:40, %rax
	movq	%rax, -8(%rbp)
	xorl	%eax, %eax
	leaq	-240(%rbp), %rax
	movq	%rax, %rsi
	leaq	.LC0(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	__isoc99_scanf@PLT
	leaq	-240(%rbp), %rax
	movq	%rax, %rdi
	call	strlen@PLT
	movl	%eax, -244(%rbp)
	movl	-244(%rbp), %eax
	subl	$2, %eax
	movl	%eax, -248(%rbp)
	jmp	.L2
.L5:
	movl	-248(%rbp), %eax
	movl	%eax, %edx
	shrl	$31, %edx
	addl	%edx, %eax
	sarl	%eax
	movslq	%eax, %rdx
	movl	-248(%rbp), %eax
	movl	%eax, %ecx
	shrl	$31, %ecx
	addl	%ecx, %eax
	sarl	%eax
	cltq
	leaq	-240(%rbp), %rcx
	addq	%rax, %rcx
	leaq	-240(%rbp), %rax
	movq	%rcx, %rsi
	movq	%rax, %rdi
	call	strncmp@PLT
	testl	%eax, %eax
	jne	.L3
	movl	-248(%rbp), %eax
	movl	%eax, %esi
	leaq	.LC1(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	printf@PLT
	movl	$0, %eax
	jmp	.L6
.L3:
	subl	$2, -248(%rbp)
.L2:
	cmpl	$0, -248(%rbp)
	jne	.L5
	movl	$0, %eax
.L6:
	movq	-8(%rbp), %rdx
	subq	%fs:40, %rdx
	je	.L7
	call	__stack_chk_fail@PLT
.L7:
	leave
	.cfi_def_cfa 7, 8
	ret
	.cfi_endproc
.LFE0:
	.size	main, .-main
	.ident	"GCC: (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0"
	.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:
```

Only output the optimized assembly code. Do not include any other text. Do not write any comments in the assembly code. Wrap the assembly code in ```assembly``` tags.
user
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"%s"
.LC1:
	.string	"%d\n"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB35:
	.cfi_startproc
	endbr64
	pushq	%r12
	.cfi_def_cfa_offset 16
	.cfi_offset 12, -16
	leaq	.LC0(%rip), %rdi
	pushq	%rbx
	.cfi_def_cfa_offset 24
	.cfi_offset 3, -24
	subq	$248, %rsp
	.cfi_def_cfa_offset 272
	movq	%fs:40, %rax
	movq	%rax, 232(%rsp)
	xorl	%eax, %eax
	movq	%rsp, %rbx
	movq	%rbx, %rsi
	call	__isoc99_scanf@PLT
	movq	%rbx, %rdi
	call	strlen@PLT
	movl	%eax, %r12d
	jmp	.L11
	.p2align 4,,10
	.p2align 3
.L14:
	movl	%r12d, %edx
	movq	%rbx, %rdi
	shrl	$31, %edx
	addl	%r12d, %edx
	sarl	%edx
	movslq	%edx, %rdx
	leaq	(%rbx,%rdx), %rsi
	call	strncmp@PLT
	testl	%eax, %eax
	je	.L13
.L11:
	subl	$2, %r12d
	jne	.L14
.L2:
	movq	232(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L15
	addq	$248, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 24
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 16
	popq	%r12
	.cfi_def_cfa_offset 8
	ret
.L13:
	.cfi_restore_state
	movl	%r12d, %edx
	leaq	.LC1(%rip), %rsi
	movl	$1, %edi
	call	__printf_chk@PLT
	jmp	.L2
.L15:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE35:
	.size	main, .-main
	.ident	"GCC: (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0"
	.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:

rule
	.file	"temp.c"
	.text
	.section	.rodata.str1.1,"aMS",@progbits,1
.LC0:
	.string	"%s"
.LC1:
	.string	"%d\n"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB35:
	.cfi_startproc
	endbr64
	pushq	%r12
	.cfi_def_cfa_offset 16
	.cfi_offset 12, -16
	leaq	.LC0(%rip), %rdi
	pushq	%rbx
	.cfi_def_cfa_offset 24
	.cfi_offset 3, -24
	subq	$248, %rsp
	.cfi_def_cfa_offset 272
	movq	%fs:40, %rax
	movq	%rax, 232(%rsp)
	xorl	%eax, %eax
	movq	%rsp, %rbx
	movq	%rbx, %rsi
	call	__isoc99_scanf@PLT
	movq	%rbx, %rdi
	call	strlen@PLT
	movl	%eax, %r12d
	jmp	.L11
	.p2align 4,,10
	.p2align 3
.L14:
	movl	%r12d, %edx
	movq	%rbx, %rdi
	shrl	$31, %edx
	addl	%r12d, %edx
	sarl	%edx
	movslq	%edx, %rdx
	leaq	(%rbx,%rdx), %rsi
	call	strncmp@PLT
	testl	%eax, %eax
	je	.L13
.L11:
	subl	$2, %r12d
	jne	.L14
.L2:
	movq	232(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L15
	addq	$248, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 24
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 16
	popq	%r12
	.cfi_def_cfa_offset 8
	ret
.L13:
	.cfi_restore_state
	movl	%r12d, %edx
	leaq	.LC1(%rip), %rsi
	movl	$1, %edi
	call	__printf_chk@PLT
	jmp	.L2
.L15:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE35:
	.size	main, .-main
	.ident	"GCC: (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0"
	.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:

#include<stdio.h>
#include<string.h>
int main(void){
  char str[222];
  scanf("%s",str);
  int n=strlen(str);
  for(int loop=n-2;loop;loop-=2){
    if(strncmp(str,str+loop/2,loop/2)==0){
      printf("%d\n",loop);
      return 0;
    }
  }
  return 0;
}
cbacbacbacba
 xxxy
 akakasaakasakasakaakas
 bbbabbbacabc
 akasakaakasakasaka`kas
 cbacbacbacbb
 abaabacaab
 bbcabcaacabc
 xxwx
 abcabcabcaac

6
 2
 4
 8
 14
 6
 6
 2
 2
 6

Given the following C code and unoptimized assembly code, your task is to generate highly optimized x86-64 assembly code.
C Code:

```c
#include<stdio.h>
#include<string.h>
int main(void){
  char str[222];
  scanf("%s",str);
  int n=strlen(str);
  for(int loop=n-2;loop;loop-=2){
    if(strncmp(str,str+loop/2,loop/2)==0){
      printf("%d\n",loop);
      return 0;
    }
  }
  return 0;
}```

Unoptimized Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.section	.rodata
.LC0:
	.string	"%s"
.LC1:
	.string	"%d\n"
	.text
	.globl	main
	.type	main, @function
main:
.LFB0:
	.cfi_startproc
	endbr64
	pushq	%rbp
	.cfi_def_cfa_offset 16
	.cfi_offset 6, -16
	movq	%rsp, %rbp
	.cfi_def_cfa_register 6
	subq	$256, %rsp
	movq	%fs:40, %rax
	movq	%rax, -8(%rbp)
	xorl	%eax, %eax
	leaq	-240(%rbp), %rax
	movq	%rax, %rsi
	leaq	.LC0(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	__isoc99_scanf@PLT
	leaq	-240(%rbp), %rax
	movq	%rax, %rdi
	call	strlen@PLT
	movl	%eax, -244(%rbp)
	movl	-244(%rbp), %eax
	subl	$2, %eax
	movl	%eax, -248(%rbp)
	jmp	.L2
.L5:
	movl	-248(%rbp), %eax
	movl	%eax, %edx
	shrl	$31, %edx
	addl	%edx, %eax
	sarl	%eax
	movslq	%eax, %rdx
	movl	-248(%rbp), %eax
	movl	%eax, %ecx
	shrl	$31, %ecx
	addl	%ecx, %eax
	sarl	%eax
	cltq
	leaq	-240(%rbp), %rcx
	addq	%rax, %rcx
	leaq	-240(%rbp), %rax
	movq	%rcx, %rsi
	movq	%rax, %rdi
	call	strncmp@PLT
	testl	%eax, %eax
	jne	.L3
	movl	-248(%rbp), %eax
	movl	%eax, %esi
	leaq	.LC1(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	printf@PLT
	movl	$0, %eax
	jmp	.L6
.L3:
	subl	$2, -248(%rbp)
.L2:
	cmpl	$0, -248(%rbp)
	jne	.L5
	movl	$0, %eax
.L6:
	movq	-8(%rbp), %rdx
	subq	%fs:40, %rdx
	je	.L7
	call	__stack_chk_fail@PLT
.L7:
	leave
	.cfi_def_cfa 7, 8
	ret
	.cfi_endproc
.LFE0:
	.size	main, .-main
	.ident	"GCC: (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0"
	.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:
```

Only output the optimized assembly code. Do not include any other text. Do not write any comments in the assembly code. Wrap the assembly code in ```assembly``` tags.
train
	.file	"temp.c"
	.text
	.section	.rodata
.LC0:
	.string	"%s"
.LC1:
	.string	"%d\n"
	.text
	.globl	main
	.type	main, @function
main:
.LFB0:
	.cfi_startproc
	endbr64
	pushq	%rbp
	.cfi_def_cfa_offset 16
	.cfi_offset 6, -16
	movq	%rsp, %rbp
	.cfi_def_cfa_register 6
	subq	$256, %rsp
	movq	%fs:40, %rax
	movq	%rax, -8(%rbp)
	xorl	%eax, %eax
	leaq	-240(%rbp), %rax
	movq	%rax, %rsi
	leaq	.LC0(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	__isoc99_scanf@PLT
	leaq	-240(%rbp), %rax
	movq	%rax, %rdi
	call	strlen@PLT
	movl	%eax, -244(%rbp)
	movl	-244(%rbp), %eax
	subl	$2, %eax
	movl	%eax, -248(%rbp)
	jmp	.L2
.L5:
	movl	-248(%rbp), %eax
	movl	%eax, %edx
	shrl	$31, %edx
	addl	%edx, %eax
	sarl	%eax
	movslq	%eax, %rdx
	movl	-248(%rbp), %eax
	movl	%eax, %ecx
	shrl	$31, %ecx
	addl	%ecx, %eax
	sarl	%eax
	cltq
	leaq	-240(%rbp), %rcx
	addq	%rax, %rcx
	leaq	-240(%rbp), %rax
	movq	%rcx, %rsi
	movq	%rax, %rdi
	call	strncmp@PLT
	testl	%eax, %eax
	jne	.L3
	movl	-248(%rbp), %eax
	movl	%eax, %esi
	leaq	.LC1(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	printf@PLT
	movl	$0, %eax
	jmp	.L6
.L3:
	subl	$2, -248(%rbp)
.L2:
	cmpl	$0, -248(%rbp)
	jne	.L5
	movl	$0, %eax
.L6:
	movq	-8(%rbp), %rdx
	subq	%fs:40, %rdx
	je	.L7
	call	__stack_chk_fail@PLT
.L7:
	leave
	.cfi_def_cfa 7, 8
	ret
	.cfi_endproc
.LFE0:
	.size	main, .-main
	.ident	"GCC: (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0"
	.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:
