user: What would the C source look like for the assembly code provided here:

```asm
<assertImplementationCStr>:
  endbr64
  push   %r15
  mov    %rdx,%r15
  push   %r14
  push   %r13
  mov    %rsi,%r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rcx,%rbx
  sub    $0x68,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,0x58(%rsp)
  xor    %eax,%eax
  test   %rdi,%rdi
  je     L62
  mov    %rdi,%r12
  call   <stdimpl_strlen@plt>
  mov    %eax,%r14d
  test   %r13,%r13
  je     L5
  mov    %r13,%rdi
  call   <stdimpl_strlen@plt>
  mov    %eax,%r8d
  cmp    $0x19,%r14d
  jle    L25
  cmp    $0x19,%eax
  jle    L1
  mov    $0x19,%r8d
  mov    $0x19,%r14d
L89:
  lea    0x10(%rsp),%rbp
  lea    D28(%rip),%rsi
  mov    %r8d,0xc(%rsp)
  mov    %rbp,%rdi
  call   <stdimpl_strcpy@plt>
  mov    %r14d,%edx
  mov    %r12,%rsi
  mov    %rbp,%rdi
  call   <stdimpl_strncat@plt>
  lea    D20(%rip),%rsi
  mov    %rbp,%rdi
  call   <stdimpl_strcat@plt>
  mov    0xc(%rsp),%edx
  mov    %r13,%rsi
  mov    %rbp,%rdi
  call   <stdimpl_strncat@plt>
  lea    D13(%rip),%rsi
  mov    %rbp,%rdi
  call   <stdimpl_strcat@plt>
  mov    %rbx,%rdx
  mov    %r15,%rsi
  mov    %rbp,%rdi
  call   <addFailure@plt>
  mov    0x58(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L101
  add    $0x68,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopw   0x0(%rax,%rax,1)
L5:
  mov    $0x2e,%eax
  mov    $0x4,%r8d
  lea    D40(%rip),%r13
  cmp    $0x19,%r14d
  jle    L89
L74:
  cmp    %eax,%r14d
  cmovg  %eax,%r14d
  jmp    L89
  nopl   0x0(%rax,%rax,1)
L62:
  test   %rsi,%rsi
  je     L66
  mov    %r13,%rdi
  mov    $0x4,%r14d
  lea    D40(%rip),%r12
  call   <stdimpl_strlen@plt>
  mov    %eax,%r8d
  mov    $0x2e,%eax
  cmp    %eax,%r8d
  cmovg  %eax,%r8d
  jmp    L89
  xchg   %ax,%ax
L66:
  lea    D40(%rip),%r12
  mov    $0x4,%r8d
  mov    $0x4,%r14d
  mov    %r12,%r13
  jmp    L89
  nopl   0x0(%rax,%rax,1)
L1:
  mov    $0x32,%eax
  sub    %r8d,%eax
  jmp    L74
  nopw   0x0(%rax,%rax,1)
L25:
  mov    $0x32,%eax
  sub    %r14d,%eax
  cmp    %eax,%r8d
  cmovg  %eax,%r8d
  jmp    L89
L101:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: disassemble_data
arguments: label: D28
type: string
name: disassemble_data
arguments: label: D20
type: string
name: disassemble_data
arguments: label: D13
type: string
name: disassemble_data
arguments: label: D40
type: string

tool: D28: exp "

tool: D20: " was "

tool: D13: "

tool: D40: null

assistant: ```c
void assertImplementationCStr(const char *expected, const char *actual, long line, const char *file) {
  char buffer[64];
  int el;
  int al;
  if (expected) {
    el = stdimpl_strlen(expected);
  } else {
    el = 4;
    expected = "null";
  }
  if (actual) {
    al = stdimpl_strlen(actual);
  } else {
    al = 4;
    actual = "null";
  }
  if (el > ((64 - 13 - 1) / 2)) {
    if (al > ((64 - 13 - 1) / 2)) {
      al = ((64 - 13 - 1) / 2);
      el = ((64 - 13 - 1) / 2);
    } else {
      int w = ((64 - 13 - 1) / 2) + (((64 - 13 - 1) / 2) - al);
      if (el > w) {
        el = w;
      }
    }
  } else {
    int w = ((64 - 13 - 1) / 2) + (((64 - 13 - 1) / 2) - el);
    if (al > w) {
      al = w;
    }
  }
  stdimpl_strcpy(buffer, "exp \"");
  stdimpl_strncat(buffer, expected, el);
  stdimpl_strcat(buffer, "\" was \"");
  stdimpl_strncat(buffer, actual, al);
  stdimpl_strcat(buffer, "\"");
  addFailure(buffer, line, file);
}
```