user: Please show me the C implementation that matches the assembly code listed below:

```asm
<srepeat>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  mov    %esi,%r13d
  push   %r12
  mov    %rdi,%r12
  push   %rbp
  push   %rbx
  sub    $0x28,%rsp
  call   <strlen@plt>
  mov    %eax,%edi
  mov    %eax,%ebx
  imul   %r13d,%edi
  call   <malloc@plt>
  mov    %rax,%rbp
  test   %r13d,%r13d
  jle    L79
  test   %ebx,%ebx
  jle    L79
  mov    %r12,%rcx
  lea    0x1(%r12),%rsi
  mov    %ebx,%r14d
  movslq %ebx,%r11
  sub    %rax,%rcx
  lea    -0x1(%rbx),%eax
  mov    %rsi,0x8(%rsp)
  and    $0xfffffff0,%r14d
  mov    %rax,(%rsp)
  mov    %rax,%r15
  lea    0x0(%rbp,%rax,1),%r8
  mov    %ebx,%eax
  shr    $0x4,%eax
  xor    %edi,%edi
  xor    %r10d,%r10d
  sub    $0x1,%eax
  add    $0x1,%rax
  shl    $0x4,%rax
  mov    %rax,0x10(%rsp)
  mov    %ebx,%eax
  and    $0xf,%eax
  mov    %eax,0x18(%rsp)
  sub    $0x1,%eax
  mov    %eax,0x1c(%rsp)
  nopl   0x0(%rax)
L187:
  mov    %r8,%rax
  sub    (%rsp),%rax
  mov    %rax,%rsi
  sub    0x8(%rsp),%rsi
  mov    %rax,%rdx
  cmp    $0xe,%rsi
  jbe    L162
  cmp    $0x6,%r15d
  jbe    L162
  cmp    $0xe,%r15d
  jbe    L30
  mov    0x10(%rsp),%rsi
  add    %rax,%rsi
L84:
  movdqu (%rdx,%rcx,1),%xmm1
  add    $0x10,%rdx
  movups %xmm1,-0x10(%rdx)
  cmp    %rsi,%rdx
  jne    L84
  cmp    %ebx,%r14d
  je     L116
  cmpl   $0x6,0x1c(%rsp)
  mov    0x18(%rsp),%r9d
  jbe    L29
  mov    %r14d,%esi
  mov    %r14d,%edx
L175:
  movq   (%r12,%rsi,1),%xmm0
  movq   %xmm0,(%rsi,%rax,1)
  mov    %r9d,%eax
  and    $0xfffffff8,%eax
  add    %eax,%edx
  cmp    %r9d,%eax
  je     L116
L81:
  movslq %edx,%rax
  movzbl (%r12,%rax,1),%esi
  lea    (%rdi,%rdx,1),%eax
  cltq
  mov    %sil,0x0(%rbp,%rax,1)
  lea    0x1(%rdx),%eax
  cmp    %eax,%ebx
  jle    L116
  movslq %eax,%rsi
  add    %edi,%eax
  movzbl (%r12,%rsi,1),%esi
  cltq
  mov    %sil,0x0(%rbp,%rax,1)
  lea    0x2(%rdx),%eax
  cmp    %eax,%ebx
  jle    L116
  movslq %eax,%rsi
  add    %edi,%eax
  movzbl (%r12,%rsi,1),%esi
  cltq
  mov    %sil,0x0(%rbp,%rax,1)
  lea    0x3(%rdx),%eax
  cmp    %eax,%ebx
  jle    L116
  movslq %eax,%rsi
  add    %edi,%eax
  movzbl (%r12,%rsi,1),%esi
  cltq
  mov    %sil,0x0(%rbp,%rax,1)
  lea    0x4(%rdx),%eax
  cmp    %eax,%ebx
  jle    L116
  movslq %eax,%rsi
  add    %edi,%eax
  movzbl (%r12,%rsi,1),%esi
  cltq
  mov    %sil,0x0(%rbp,%rax,1)
  lea    0x5(%rdx),%eax
  cmp    %eax,%ebx
  jle    L116
  movslq %eax,%rsi
  add    %edi,%eax
  add    $0x6,%edx
  movzbl (%r12,%rsi,1),%esi
  cltq
  mov    %sil,0x0(%rbp,%rax,1)
  cmp    %edx,%ebx
  jle    L116
  movslq %edx,%rax
  add    %edi,%edx
  movzbl (%r12,%rax,1),%eax
  movslq %edx,%rdx
  mov    %al,0x0(%rbp,%rdx,1)
L116:
  add    $0x1,%r10d
  add    %ebx,%edi
  sub    %r11,%rcx
  add    %r11,%r8
  cmp    %r10d,%r13d
  jne    L187
L79:
  mov    %rbp,%rsi
  mov    %r12,%rdi
  call   <strcpy@plt>
  mov    %rbp,%rdi
  call   <free@plt>
  add    $0x28,%rsp
  mov    %r12,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   (%rax)
L162:
  movzbl (%rcx,%rax,1),%edx
  mov    %dl,(%rax)
  mov    %rax,%rdx
  add    $0x1,%rax
  cmp    %r8,%rdx
  jne    L162
  jmp    L116
L30:
  mov    %ebx,%r9d
  xor    %esi,%esi
  xor    %edx,%edx
  jmp    L175
L29:
  mov    %r14d,%edx
  jmp    L81
```

assistant: ```c
char *srepeat(char *str, int n) {
  int l = strlen(str);
  char *tmp = (char *)malloc(n * l);
  int i, z = 0;
  for (i = 0; i < n; ++i) {
    for (z = 0; z < l; ++z) {
      tmp[(i * l) + z] = str[z];
    }
  }
  strcpy(str, tmp);
  free(tmp);
  return str;
}
```