user: What is the c source code of the assembly code below:

```asm
<MyEncode>:
  endbr64
  push   %r13
  mov    %rdi,%r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x18,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x8(%rsp)
  xor    %eax,%eax
  call   <strlen@plt>
  lea    0x1(%rax),%r12d
  mov    %eax,%ebx
  mov    %r12d,%edi
  call   <malloc@plt>
  mov    %r12d,%edx
  mov    %r13,%rsi
  mov    %rax,%rdi
  mov    %rax,%rbp
  call   <memcpy@plt>
  test   %r12d,%r12d
  jle    L31
  cmp    $0xe,%ebx
  jbe    L96
  mov    %r12d,%edx
  movdqa D35(%rip),%xmm2
  movdqa D9(%rip),%xmm1
  mov    %rbp,%rax
  shr    $0x4,%edx
  sub    $0x1,%edx
  shl    $0x4,%rdx
  lea    0x10(%rbp,%rdx,1),%rdx
  nopl   0x0(%rax)
L22:
  movdqu (%rax),%xmm0
  add    $0x10,%rax
  pxor   %xmm2,%xmm0
  paddb  %xmm1,%xmm0
  movups %xmm0,-0x10(%rax)
  cmp    %rdx,%rax
  jne    L22
  mov    %r12d,%eax
  and    $0xfffffff0,%eax
  mov    %eax,%edx
  cmp    %eax,%r12d
  je     L31
L121:
  mov    %ebx,%esi
  sub    %eax,%esi
  lea    0x1(%rsi),%ecx
  cmp    $0x6,%esi
  jbe    L87
  movq   D35(%rip),%xmm1
  add    %rbp,%rax
  movq   (%rax),%xmm0
  pxor   %xmm1,%xmm0
  movq   D9(%rip),%xmm1
  paddb  %xmm1,%xmm0
  movq   %xmm0,(%rax)
  mov    %ecx,%eax
  and    $0xfffffff8,%eax
  add    %eax,%edx
  cmp    %eax,%ecx
  je     L31
L87:
  movslq %edx,%rcx
  lea    0x1(%rdx),%esi
  add    %rbp,%rcx
  movzbl (%rcx),%eax
  xor    $0x19,%eax
  sub    $0x7a,%eax
  mov    %al,(%rcx)
  cmp    %edx,%ebx
  jle    L31
  movslq %esi,%rcx
  lea    0x2(%rdx),%edi
  add    %rbp,%rcx
  movzbl (%rcx),%eax
  xor    $0x19,%eax
  sub    $0x7a,%eax
  mov    %al,(%rcx)
  cmp    %esi,%ebx
  jle    L31
  movslq %edi,%rcx
  lea    0x3(%rdx),%esi
  add    %rbp,%rcx
  movzbl (%rcx),%eax
  xor    $0x19,%eax
  sub    $0x7a,%eax
  mov    %al,(%rcx)
  cmp    %edi,%ebx
  jle    L31
  movslq %esi,%rcx
  lea    0x4(%rdx),%edi
  add    %rbp,%rcx
  movzbl (%rcx),%eax
  xor    $0x19,%eax
  sub    $0x7a,%eax
  mov    %al,(%rcx)
  cmp    %esi,%ebx
  jle    L31
  movslq %edi,%rcx
  lea    0x5(%rdx),%esi
  add    %rbp,%rcx
  movzbl (%rcx),%eax
  xor    $0x19,%eax
  sub    $0x7a,%eax
  mov    %al,(%rcx)
  cmp    %edi,%ebx
  jle    L31
  movslq %esi,%rcx
  add    $0x6,%edx
  add    %rbp,%rcx
  movzbl (%rcx),%eax
  xor    $0x19,%eax
  sub    $0x7a,%eax
  mov    %al,(%rcx)
  cmp    %esi,%ebx
  jle    L31
  movslq %edx,%rdx
  lea    0x0(%rbp,%rdx,1),%rax
  movzbl (%rax),%edx
  xor    $0x19,%edx
  sub    $0x7a,%edx
  mov    %dl,(%rax)
L31:
  mov    %rsp,%rdx
  mov    %r12d,%esi
  mov    %rbp,%rdi
  call   <base64_encode@plt>
  mov    %rbp,%rdi
  call   <free@plt>
  mov    (%rsp),%rax
  mov    0x8(%rsp),%rdx
  sub    %fs:0x28,%rdx
  jne    L38
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
L96:
  xor    %eax,%eax
  xor    %edx,%edx
  jmp    L121
L38:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: disassemble_data
arguments: data_label: D35
type: byte[16]
name: disassemble_data
arguments: data_label: D9
type: byte[16]

tool: {"D35": [0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19,0x19]}

tool: {"D9": [0x86,0x86,0x86,0x86,0x86,0x86,0x86,0x86,0x86,0x86,0x86,0x86,0x86,0x86,0x86,0x86]}

assistant: ```c
char *MyEncode(char *str) {
  int i, len;
  char *p;
  char *s, *data;
  len = strlen(str) + 1;
  s = (char *)malloc(len);
  memcpy(s, str, len);
  for (i = 0; i < len; i++) {
    s[i] ^= 0x19;
    s[i] += 0x86;
  }
  base64_encode(s, len, &data);
  free(s);
  return data;
}
```