user: 请从给定的汇编指令推导出C源代码：

```asm
<main>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  lea    -0x5000(%rsp),%r11
L242:
  sub    $0x1000,%rsp
  orq    $0x0,(%rsp)
  cmp    %r11,%rsp
  jne    L242
  sub    $0x8b8,%rsp
  mov    $0x57e4,%edx
  xor    %esi,%esi
  mov    %fs:0x28,%rax
  mov    %rax,0x58a8(%rsp)
  xor    %eax,%eax
  lea    0x10(%rsp),%rbp
  lea    0x5850(%rsp),%rbx
  mov    %rbp,%rdi
  call   <memset@plt>
  lea    D100(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  lea    0x5800(%rsp),%rax
  mov    %rax,%rdi
  mov    %rax,0x8(%rsp)
  call   <gets@plt>
  lea    D49(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    %rbx,%rdi
  call   <gets@plt>
  movzbl 0x5800(%rsp),%edi
  movzbl 0x5850(%rsp),%eax
  test   %dil,%dil
  je     L232
  lea    0x5801(%rsp),%rcx
  mov    %rbp,%rsi
  mov    %edi,%edx
  nopl   0x0(%rax,%rax,1)
L9:
  cmp    %dl,%al
  jne    L46
  movl   $0x1,(%rsi)
L46:
  movzbl (%rcx),%edx
  add    $0x12c,%rsi
  add    $0x1,%rcx
  test   %dl,%dl
  jne    L9
L232:
  mov    $0x1,%edx
  lea    0x584f(%rsp),%rcx
  test   %al,%al
  je     L37
  nopl   (%rax)
L285:
  cmp    %al,%dil
  jne    L34
  movl   $0x1,-0x4(%rbp,%rdx,4)
L34:
  add    $0x1,%rdx
  movzbl (%rcx,%rdx,1),%eax
  test   %al,%al
  jne    L285
L37:
  movzbl 0x5801(%rsp),%ecx
  test   %cl,%cl
  je     L156
  movzbl 0x5851(%rsp),%r10d
  lea    0x5802(%rsp),%r9
  mov    %rbp,%r8
  lea    0x13c(%rsp),%rdi
  lea    0x584f(%rsp),%rsi
  nopl   0x0(%rax)
L98:
  mov    %r10d,%edx
  mov    $0x2,%eax
  test   %r10b,%r10b
  je     L111
  nopl   (%rax)
L68:
  cmp    %cl,%dl
  jne    L225
  mov    -0x8(%r8,%rax,4),%edx
  add    $0x1,%edx
  mov    %edx,-0x4(%rdi,%rax,4)
L225:
  add    $0x1,%rax
  movzbl (%rsi,%rax,1),%edx
  test   %dl,%dl
  jne    L68
L111:
  movzbl (%r9),%ecx
  add    $0x12c,%r8
  add    $0x1,%r9
  add    $0x12c,%rdi
  test   %cl,%cl
  jne    L98
L156:
  mov    $0xa,%edi
  lea    D29(%rip),%r14
  xor    %r12d,%r12d
  call   <putchar@plt>
  xor    %eax,%eax
  mov    %r14,%rdi
  lea    D24(%rip),%r13
  call   <printf@plt>
  cmpb   $0x0,0x5850(%rsp)
  je     L203
  nopl   (%rax)
L289:
  mov    %r12d,%esi
  xor    %eax,%eax
  mov    %r13,%rdi
  add    $0x1,%r12
  call   <printf@plt>
  cmpb   $0x0,(%rbx,%r12,1)
  jne    L289
L203:
  mov    $0xa,%edi
  lea    0x5851(%rsp),%r13
  lea    D104(%rip),%r12
  call   <putchar@plt>
  mov    %r14,%rdi
  xor    %eax,%eax
  call   <printf@plt>
  movsbl 0x5850(%rsp),%esi
  test   %sil,%sil
  je     L201
L196:
  mov    %r12,%rdi
  xor    %eax,%eax
  add    $0x1,%r13
  call   <printf@plt>
  movsbl -0x1(%r13),%esi
  test   %sil,%sil
  jne    L196
L201:
  mov    $0xa,%edi
  call   <putchar@plt>
  movsbl 0x5800(%rsp),%edx
  test   %dl,%dl
  je     L253
  lea    0x5801(%rsp),%rax
  mov    %rbp,%r12
  xor    %r14d,%r14d
  mov    %rax,(%rsp)
  lea    D24(%rip),%r13
  nopl   0x0(%rax,%rax,1)
L108:
  xor    %eax,%eax
  mov    %r14d,%esi
  lea    D54(%rip),%rdi
  xor    %r15d,%r15d
  call   <printf@plt>
  cmpb   $0x0,0x5850(%rsp)
  je     L205
  xchg   %ax,%ax
L158:
  mov    (%r12,%r15,4),%esi
  xor    %eax,%eax
  mov    %r13,%rdi
  add    $0x1,%r15
  call   <printf@plt>
  cmpb   $0x0,(%rbx,%r15,1)
  jne    L158
L205:
  mov    $0xa,%edi
  add    $0x12c,%r12
  call   <putchar@plt>
  mov    (%rsp),%rax
  movsbl (%rax,%r14,1),%edx
  add    $0x1,%r14
  test   %dl,%dl
  jne    L108
  cmpb   $0x0,0x5800(%rsp)
  je     L253
  movzbl 0x5850(%rsp),%edi
  xor    %esi,%esi
  xor    %r8d,%r8d
  xor    %r13d,%r13d
  xor    %r12d,%r12d
  nopl   0x0(%rax)
L171:
  mov    %esi,%ecx
  xor    %eax,%eax
  test   %dil,%dil
  je     L59
  nopl   0x0(%rax)
L249:
  mov    0x0(%rbp,%rax,4),%edx
  cmp    %r12d,%edx
  jle    L39
  mov    %eax,%r8d
  mov    %ecx,%r13d
  mov    %edx,%r12d
L39:
  add    $0x1,%rax
  cmpb   $0x0,(%rbx,%rax,1)
  jne    L249
L59:
  mov    (%rsp),%rax
  add    $0x12c,%rbp
  movzbl (%rax,%rsi,1),%eax
  add    $0x1,%rsi
  test   %al,%al
  jne    L171
  mov    %r8d,%ecx
  mov    %r13d,%edx
  mov    %r12d,%esi
  xor    %eax,%eax
  lea    D47(%rip),%rdi
  call   <printf@plt>
  lea    D89(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  mov    %r13d,%eax
  sub    %r12d,%eax
  cmp    %r13d,%eax
  jge    L2
  mov    (%rsp),%r15
  movslq %eax,%rdx
  mov    0x8(%rsp),%rbp
  sub    $0x1,%r13d
  sub    %eax,%r13d
  add    %rdx,%r15
  add    %rdx,%rbp
  add    %r15,%r13
  nop
L272:
  movsbl 0x1(%rbp),%edi
  add    $0x1,%rbp
  call   <putchar@plt>
  cmp    %rbp,%r13
  jne    L272
L2:
  mov    $0xa,%edi
  call   <putchar@plt>
  mov    0x58a8(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L244
  add    $0x58b8,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L253:
  xor    %ecx,%ecx
  xor    %edx,%edx
  xor    %esi,%esi
  xor    %eax,%eax
  lea    D47(%rip),%rdi
  call   <printf@plt>
  lea    D89(%rip),%rdi
  xor    %eax,%eax
  call   <printf@plt>
  jmp    L2
L244:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: disassemble_data
arguments: data_tag: D100
data_type: string
name: disassemble_data
arguments: data_tag: D49
data_type: string
name: disassemble_data
arguments: data_tag: D29
data_type: string
name: disassemble_data
arguments: data_tag: D24
data_type: string
name: disassemble_data
arguments: data_tag: D104
data_type: string
name: disassemble_data
arguments: data_tag: D54
data_type: string
name: disassemble_data
arguments: data_tag: D47
data_type: string
name: disassemble_data
arguments: data_tag: D89
data_type: string

tool: D100: String 1: 

tool: D49: String 2: 

tool: D29:     

tool: D24: %3d

tool: D104:   %c

tool: D54: %2d %c

tool: D47: 

max=%d	maxi=%d	maxj=%d



tool: D89: Longest substring: 

assistant: ```c
void main() {
  char a[75], b[75];
  int mat[75][75] = {0};
  int i = 1, j = 1, max = 0, maxi = 0, maxj = 0;
  printf("String 1: ");
  gets(a);
  printf("String 2: ");
  gets(b);
  for (i = 0; a[i]; i++)
    if (a[i] == b[0])
      mat[i][0] = 1;
  for (j = 0; b[j]; j++)
    if (a[0] == b[j])
      mat[0][j] = 1;
  for (i = 1; a[i]; i++) {
    for (j = 1; b[j]; j++) {
      if (a[i] == b[j]) {
        mat[i][j] = mat[i - 1][j - 1] + 1;
      }
    }
  }
  printf("\n");
  printf("    ");
  for (j = 0; b[j]; j++)
    printf("%3d", j);
  printf("\n");
  printf("    ");
  for (j = 0; b[j]; j++)
    printf("  %c", b[j]);
  printf("\n");
  for (i = 0; a[i]; i++) {
    printf("%2d %c", i, a[i]);
    for (j = 0; b[j]; j++) {
      printf("%3d", mat[i][j]);
    }
    printf("\n");
  }
  for (i = 0; a[i]; i++) {
    for (j = 0; b[j]; j++) {
      if (mat[i][j] > max) {
        max = mat[i][j];
        maxi = i;
        maxj = j;
      }
    }
  }
  printf("\n\nmax=%d\tmaxi=%d\tmaxj=%d\n\n", max, maxi, maxj);
  printf("Longest substring: ");
  for (i = maxi - max + 1; i <= maxi; i++)
    printf("%c", a[i]);
  printf("\n");
}
```