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

```asm
<karatsuba>:
  endbr64
  push   %r15
  push   %r14
  mov    %edi,%r14d
  mov    %esi,%edi
  push   %r13
  push   %r12
  mov    %esi,%r12d
  push   %rbp
  push   %rbx
  sub    $0x8,%rsp
  call   <size_base_2@plt>
  mov    %r14d,%edi
  mov    %rax,%rbx
  call   <size_base_2@plt>
  mov    %rbx,%r8
  mov    %r12d,%ecx
  mov    %r14d,%esi
  mov    %eax,%edx
  lea    D9(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  cmp    $0x9,%r14d
  jle    L2
  cmp    $0x9,%r12d
  jle    L2
  mov    %r14d,%edi
  call   <size_base_2@plt>
  mov    %r12d,%edi
  mov    %rax,%rbx
  call   <size_base_2@plt>
  cmp    %rax,%rbx
  jle    L38
  mov    %r14d,%edi
  call   <size_base_2@plt>
L6:
  mov    %eax,%edi
  mov    %r14d,%ebp
  lea    D5(%rip),%rbx
  shr    $0x1f,%edi
  add    %eax,%edi
  sar    %edi
  call   <floor@plt>
  mov    %rbx,%rdi
  mov    %eax,%r13d
  mov    %eax,%ecx
  mov    %r14d,%eax
  mov    %r12d,%r14d
  sar    %cl,%ebp
  cltd
  idiv   %ebp
  xor    %eax,%eax
  mov    %edx,%r15d
  mov    %ebp,%edx
  mov    %r15d,%esi
  call   <printf@plt>
  mov    %r13d,%ecx
  mov    %r12d,%eax
  mov    %rbx,%rdi
  sar    %cl,%r14d
  cltd
  idiv   %r14d
  xor    %eax,%eax
  mov    %edx,%r12d
  mov    %r14d,%edx
  mov    %r12d,%esi
  call   <printf@plt>
  mov    %r12d,%esi
  mov    %r15d,%edi
  call   <karatsuba>
  lea    (%r14,%r12,1),%esi
  lea    0x0(%rbp,%r15,1),%edi
  mov    %eax,%ebx
  call   <karatsuba>
  mov    %r14d,%esi
  mov    %ebp,%edi
  mov    %eax,%r12d
  call   <karatsuba>
  lea    0x0(%r13,%r13,1),%esi
  mov    $0x2,%edi
  mov    %eax,%r14d
  call   <pow@plt>
  sub    %r14d,%r12d
  mov    %r13d,%esi
  mov    $0x2,%edi
  imul   %r14d,%eax
  sub    %ebx,%r12d
  mov    %eax,%ebp
  call   <pow@plt>
  add    $0x8,%rsp
  imul   %eax,%r12d
  add    %ebp,%r12d
  lea    (%r12,%rbx,1),%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopw   0x0(%rax,%rax,1)
L2:
  add    $0x8,%rsp
  mov    %r12d,%eax
  pop    %rbx
  imul   %r14d,%eax
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  xchg   %ax,%ax
L38:
  mov    %r12d,%edi
  call   <size_base_2@plt>
  jmp    L6
```

tool_calls: name: unpack_data
arguments: data_label: D9
datatype: string
name: unpack_data
arguments: data_label: D5
datatype: string

tool: D9: a is %i  and a_length : %i AND b is %i b_length : %i


tool: D5: low : %i high : %i


assistant: ```c
int32_t karatsuba(int32_t a, int32_t b) {
  printf("a is %i  and a_length : %i AND b is %i b_length : %i\n", a, size_base_2(a), b, size_base_2(b));
  if ((a < 10) || (b < 10)) {
    return a * b;
  }
  int32_t m = (((size_base_2(a)) > (size_base_2(b))) ? (size_base_2(a)) : (size_base_2(b)));
  int32_t m2 = floor(m / 2);
  int32_t high1 = a >> m2;
  int32_t low1 = a % high1;
  printf("low : %i high : %i\n", low1, high1);
  int32_t high2 = b >> m2;
  int32_t low2 = b % high2;
  printf("low : %i high : %i\n", low2, high2);
  int32_t z0 = karatsuba(low1, low2);
  int32_t z1 = karatsuba((low1 + high1), (low2 + high2));
  int32_t z2 = karatsuba(high1, high2);
  return (z2 * pow(2, (2 * m2))) + ((z1 - z2 - z0) * pow(2, m2)) + (z0);
}
```