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 <stdlib.h>

int main () {
    int N;
    scanf("%d", &N);
    char *S = malloc((1+N) * sizeof(char));
    scanf("%s", S);
    char prev = S[0];
    int ans = 1;
    for (int i = 1; i < N; i++) {
        if (prev != S[i])
            ans++;
        prev = S[i];
    }

    printf("%d\n", ans);
    return 0;
}
```

Unoptimized Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.section	.rodata
.LC0:
	.string	"%d"
.LC1:
	.string	"%s"
.LC2:
	.string	"%d\n"
	.text
	.globl	main
	.type	main, @function
main:
.LFB6:
	.cfi_startproc
	endbr64
	pushq	%rbp
	.cfi_def_cfa_offset 16
	.cfi_offset 6, -16
	movq	%rsp, %rbp
	.cfi_def_cfa_register 6
	subq	$32, %rsp
	movq	%fs:40, %rax
	movq	%rax, -8(%rbp)
	xorl	%eax, %eax
	leaq	-28(%rbp), %rax
	movq	%rax, %rsi
	leaq	.LC0(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	__isoc99_scanf@PLT
	movl	-28(%rbp), %eax
	addl	$1, %eax
	cltq
	movq	%rax, %rdi
	call	malloc@PLT
	movq	%rax, -16(%rbp)
	movq	-16(%rbp), %rax
	movq	%rax, %rsi
	leaq	.LC1(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	__isoc99_scanf@PLT
	movq	-16(%rbp), %rax
	movzbl	(%rax), %eax
	movb	%al, -29(%rbp)
	movl	$1, -24(%rbp)
	movl	$1, -20(%rbp)
	jmp	.L2
.L4:
	movl	-20(%rbp), %eax
	movslq	%eax, %rdx
	movq	-16(%rbp), %rax
	addq	%rdx, %rax
	movzbl	(%rax), %eax
	cmpb	%al, -29(%rbp)
	je	.L3
	addl	$1, -24(%rbp)
.L3:
	movl	-20(%rbp), %eax
	movslq	%eax, %rdx
	movq	-16(%rbp), %rax
	addq	%rdx, %rax
	movzbl	(%rax), %eax
	movb	%al, -29(%rbp)
	addl	$1, -20(%rbp)
.L2:
	movl	-28(%rbp), %eax
	cmpl	%eax, -20(%rbp)
	jl	.L4
	movl	-24(%rbp), %eax
	movl	%eax, %esi
	leaq	.LC2(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	printf@PLT
	movl	$0, %eax
	movq	-8(%rbp), %rdx
	subq	%fs:40, %rdx
	je	.L6
	call	__stack_chk_fail@PLT
.L6:
	leave
	.cfi_def_cfa 7, 8
	ret
	.cfi_endproc
.LFE6:
	.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	"%d"
.LC1:
	.string	"%s"
.LC2:
	.string	"%d\n"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB39:
	.cfi_startproc
	endbr64
	pushq	%rbx
	.cfi_def_cfa_offset 16
	.cfi_offset 3, -16
	leaq	.LC0(%rip), %rdi
	subq	$16, %rsp
	.cfi_def_cfa_offset 32
	movq	%fs:40, %rax
	movq	%rax, 8(%rsp)
	xorl	%eax, %eax
	leaq	4(%rsp), %rsi
	call	__isoc99_scanf@PLT
	movl	4(%rsp), %eax
	leal	1(%rax), %edi
	movslq	%edi, %rdi
	call	malloc@PLT
	leaq	.LC1(%rip), %rdi
	movq	%rax, %rbx
	movq	%rax, %rsi
	xorl	%eax, %eax
	call	__isoc99_scanf@PLT
	movslq	4(%rsp), %rax
	movzbl	(%rbx), %ecx
	cmpl	$1, %eax
	jle	.L6
	leaq	1(%rbx), %rdx
	addq	%rbx, %rax
	movl	$1, %r8d
	.p2align 4,,10
	.p2align 3
.L4:
	movl	%ecx, %esi
	movzbl	(%rdx), %ecx
	cmpb	%cl, %sil
	setne	%sil
	addq	$1, %rdx
	movzbl	%sil, %esi
	addl	%esi, %r8d
	cmpq	%rax, %rdx
	jne	.L4
.L2:
	xorl	%eax, %eax
	movl	%r8d, %edx
	movl	$1, %edi
	leaq	.LC2(%rip), %rsi
	call	__printf_chk@PLT
	movq	8(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L10
	addq	$16, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 16
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 8
	ret
.L6:
	.cfi_restore_state
	movl	$1, %r8d
	jmp	.L2
.L10:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE39:
	.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	"%d"
.LC1:
	.string	"%s"
.LC2:
	.string	"%d\n"
	.section	.text.startup,"ax",@progbits
	.p2align 4
	.globl	main
	.type	main, @function
main:
.LFB39:
	.cfi_startproc
	endbr64
	pushq	%rbx
	.cfi_def_cfa_offset 16
	.cfi_offset 3, -16
	leaq	.LC0(%rip), %rdi
	subq	$16, %rsp
	.cfi_def_cfa_offset 32
	movq	%fs:40, %rax
	movq	%rax, 8(%rsp)
	xorl	%eax, %eax
	leaq	4(%rsp), %rsi
	call	__isoc99_scanf@PLT
	movl	4(%rsp), %eax
	leal	1(%rax), %edi
	movslq	%edi, %rdi
	call	malloc@PLT
	leaq	.LC1(%rip), %rdi
	movq	%rax, %rbx
	movq	%rax, %rsi
	xorl	%eax, %eax
	call	__isoc99_scanf@PLT
	movslq	4(%rsp), %rax
	movzbl	(%rbx), %ecx
	cmpl	$1, %eax
	jle	.L6
	leaq	1(%rbx), %rdx
	addq	%rbx, %rax
	movl	$1, %r8d
	.p2align 4,,10
	.p2align 3
.L4:
	movl	%ecx, %esi
	movzbl	(%rdx), %ecx
	cmpb	%cl, %sil
	setne	%sil
	addq	$1, %rdx
	movzbl	%sil, %esi
	addl	%esi, %r8d
	cmpq	%rax, %rdx
	jne	.L4
.L2:
	xorl	%eax, %eax
	movl	%r8d, %edx
	movl	$1, %edi
	leaq	.LC2(%rip), %rsi
	call	__printf_chk@PLT
	movq	8(%rsp), %rax
	subq	%fs:40, %rax
	jne	.L10
	addq	$16, %rsp
	.cfi_remember_state
	.cfi_def_cfa_offset 16
	xorl	%eax, %eax
	popq	%rbx
	.cfi_def_cfa_offset 8
	ret
.L6:
	.cfi_restore_state
	movl	$1, %r8d
	jmp	.L2
.L10:
	call	__stack_chk_fail@PLT
	.cfi_endproc
.LFE39:
	.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 <stdlib.h>

int main () {
    int N;
    scanf("%d", &N);
    char *S = malloc((1+N) * sizeof(char));
    scanf("%s", S);
    char prev = S[0];
    int ans = 1;
    for (int i = 1; i < N; i++) {
        if (prev != S[i])
            ans++;
        prev = S[i];
    }

    printf("%d\n", ans);
    return 0;
}

20
xxzaffeeeeedfkkkkllq
 5
aaaab
 10
aabbcbaaca
 20
xfzaffeeeeedxkkkkllq
 20
xfzaffeeeeedxkkkkmlq
 5
aa`ab
 10
acaaacbbaa
 20
xfzaffedeeedxkkkkmlq
 5
aa``b
 20
xfzaefedeeedxkkkkmlq

10
 2
 7
 11
 12
 4
 6
 14
 3
 15

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 <stdlib.h>

int main () {
    int N;
    scanf("%d", &N);
    char *S = malloc((1+N) * sizeof(char));
    scanf("%s", S);
    char prev = S[0];
    int ans = 1;
    for (int i = 1; i < N; i++) {
        if (prev != S[i])
            ans++;
        prev = S[i];
    }

    printf("%d\n", ans);
    return 0;
}
```

Unoptimized Assembly Code:

```assembly
	.file	"temp.c"
	.text
	.section	.rodata
.LC0:
	.string	"%d"
.LC1:
	.string	"%s"
.LC2:
	.string	"%d\n"
	.text
	.globl	main
	.type	main, @function
main:
.LFB6:
	.cfi_startproc
	endbr64
	pushq	%rbp
	.cfi_def_cfa_offset 16
	.cfi_offset 6, -16
	movq	%rsp, %rbp
	.cfi_def_cfa_register 6
	subq	$32, %rsp
	movq	%fs:40, %rax
	movq	%rax, -8(%rbp)
	xorl	%eax, %eax
	leaq	-28(%rbp), %rax
	movq	%rax, %rsi
	leaq	.LC0(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	__isoc99_scanf@PLT
	movl	-28(%rbp), %eax
	addl	$1, %eax
	cltq
	movq	%rax, %rdi
	call	malloc@PLT
	movq	%rax, -16(%rbp)
	movq	-16(%rbp), %rax
	movq	%rax, %rsi
	leaq	.LC1(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	__isoc99_scanf@PLT
	movq	-16(%rbp), %rax
	movzbl	(%rax), %eax
	movb	%al, -29(%rbp)
	movl	$1, -24(%rbp)
	movl	$1, -20(%rbp)
	jmp	.L2
.L4:
	movl	-20(%rbp), %eax
	movslq	%eax, %rdx
	movq	-16(%rbp), %rax
	addq	%rdx, %rax
	movzbl	(%rax), %eax
	cmpb	%al, -29(%rbp)
	je	.L3
	addl	$1, -24(%rbp)
.L3:
	movl	-20(%rbp), %eax
	movslq	%eax, %rdx
	movq	-16(%rbp), %rax
	addq	%rdx, %rax
	movzbl	(%rax), %eax
	movb	%al, -29(%rbp)
	addl	$1, -20(%rbp)
.L2:
	movl	-28(%rbp), %eax
	cmpl	%eax, -20(%rbp)
	jl	.L4
	movl	-24(%rbp), %eax
	movl	%eax, %esi
	leaq	.LC2(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	printf@PLT
	movl	$0, %eax
	movq	-8(%rbp), %rdx
	subq	%fs:40, %rdx
	je	.L6
	call	__stack_chk_fail@PLT
.L6:
	leave
	.cfi_def_cfa 7, 8
	ret
	.cfi_endproc
.LFE6:
	.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	"%d"
.LC1:
	.string	"%s"
.LC2:
	.string	"%d\n"
	.text
	.globl	main
	.type	main, @function
main:
.LFB6:
	.cfi_startproc
	endbr64
	pushq	%rbp
	.cfi_def_cfa_offset 16
	.cfi_offset 6, -16
	movq	%rsp, %rbp
	.cfi_def_cfa_register 6
	subq	$32, %rsp
	movq	%fs:40, %rax
	movq	%rax, -8(%rbp)
	xorl	%eax, %eax
	leaq	-28(%rbp), %rax
	movq	%rax, %rsi
	leaq	.LC0(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	__isoc99_scanf@PLT
	movl	-28(%rbp), %eax
	addl	$1, %eax
	cltq
	movq	%rax, %rdi
	call	malloc@PLT
	movq	%rax, -16(%rbp)
	movq	-16(%rbp), %rax
	movq	%rax, %rsi
	leaq	.LC1(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	__isoc99_scanf@PLT
	movq	-16(%rbp), %rax
	movzbl	(%rax), %eax
	movb	%al, -29(%rbp)
	movl	$1, -24(%rbp)
	movl	$1, -20(%rbp)
	jmp	.L2
.L4:
	movl	-20(%rbp), %eax
	movslq	%eax, %rdx
	movq	-16(%rbp), %rax
	addq	%rdx, %rax
	movzbl	(%rax), %eax
	cmpb	%al, -29(%rbp)
	je	.L3
	addl	$1, -24(%rbp)
.L3:
	movl	-20(%rbp), %eax
	movslq	%eax, %rdx
	movq	-16(%rbp), %rax
	addq	%rdx, %rax
	movzbl	(%rax), %eax
	movb	%al, -29(%rbp)
	addl	$1, -20(%rbp)
.L2:
	movl	-28(%rbp), %eax
	cmpl	%eax, -20(%rbp)
	jl	.L4
	movl	-24(%rbp), %eax
	movl	%eax, %esi
	leaq	.LC2(%rip), %rax
	movq	%rax, %rdi
	movl	$0, %eax
	call	printf@PLT
	movl	$0, %eax
	movq	-8(%rbp), %rdx
	subq	%fs:40, %rdx
	je	.L6
	call	__stack_chk_fail@PLT
.L6:
	leave
	.cfi_def_cfa 7, 8
	ret
	.cfi_endproc
.LFE6:
	.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:
