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

```asm
<encrypt_Feistel>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  mov    $0x1,%r12d
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  movzbl 0x1(%rsi),%edx
  mov    %fs:0x28,%rax
  mov    %rax,0x28(%rsp)
  xor    %eax,%eax
  movzbl (%rsi),%eax
  mov    %dl,0x1d(%rsp)
  mov    %al,0x1c(%rsp)
  mov    %dl,0x1e(%rsp)
  movzbl 0x2(%rsi),%edx
  mov    %al,0x23(%rsp)
  movzwl (%rdi),%eax
  mov    %dl,0x1f(%rsp)
  mov    %dl,0x20(%rsp)
  movzbl 0x3(%rsi),%edx
  mov    %ax,0x24(%rsp)
  movzwl 0x2(%rdi),%eax
  mov    $0x28,%edi
  mov    %dl,0x21(%rsp)
  mov    %dl,0x22(%rsp)
  mov    %ax,0x26(%rsp)
  call   <malloc@plt>
  mov    %rax,%r15
  lea    0x20(%rsp),%rax
  mov    %rax,0x8(%rsp)
  lea    -0x1(%r12),%eax
  cmp    $0x3,%r12d
  je     L80
L117:
  cmp    $0x3,%eax
  je     L33
  cmp    $0x1,%eax
  je     L3
  lea    0x24(%rsp),%rdi
  lea    0x26(%rsp),%r14
  call   <encrypt@plt>
  lea    0x1c(%rsp),%rsi
  mov    %r14,%rdi
  mov    %rax,%rbx
  call   <function@plt>
  xor    %edx,%edx
  nopl   (%rax)
L109:
  mov    (%rbx,%rdx,1),%ecx
  xor    (%rax,%rdx,1),%ecx
  mov    %ecx,(%r15,%rdx,1)
  add    $0x4,%rdx
  cmp    $0x28,%rdx
  jne    L109
  mov    %r15,%rdi
  call   <decrypt@plt>
  mov    %rax,%rbx
  cmp    $0x4,%r12d
  je     L74
L116:
  add    $0x1,%r12d
  lea    -0x1(%r12),%eax
  cmp    $0x3,%r12d
  jne    L117
L80:
  mov    %r13,%rdi
  call   <encrypt@plt>
  mov    0x8(%rsp),%rsi
  mov    %rbp,%rdi
  mov    %rax,%rbx
  call   <function@plt>
  xor    %edx,%edx
  nopw   0x0(%rax,%rax,1)
L24:
  mov    (%rbx,%rdx,1),%ecx
  xor    (%rax,%rdx,1),%ecx
  mov    %ecx,(%r15,%rdx,1)
  add    $0x4,%rdx
  cmp    $0x28,%rdx
  jne    L24
  mov    %r15,%rdi
  mov    %rbp,%r14
  call   <decrypt@plt>
  mov    %rax,%rbx
  jmp    L116
  nopl   0x0(%rax)
L3:
  mov    %r14,%rdi
  call   <encrypt@plt>
  lea    0x1e(%rsp),%rsi
  mov    %rbx,%rdi
  mov    %rax,%rbp
  call   <function@plt>
  xor    %edx,%edx
  nopw   0x0(%rax,%rax,1)
L90:
  mov    0x0(%rbp,%rdx,1),%ecx
  xor    (%rax,%rdx,1),%ecx
  mov    %ecx,(%r15,%rdx,1)
  add    $0x4,%rdx
  cmp    $0x28,%rdx
  jne    L90
  mov    %r15,%rdi
  mov    %rbx,%r13
  call   <decrypt@plt>
  mov    %rax,%rbp
  jmp    L116
  nopl   0x0(%rax,%rax,1)
L33:
  mov    %r14,%rdi
  call   <encrypt@plt>
  lea    0x22(%rsp),%rsi
  mov    %rbx,%rdi
  mov    %rax,%rbp
  call   <function@plt>
  xor    %edx,%edx
  nopw   0x0(%rax,%rax,1)
L84:
  mov    0x0(%rbp,%rdx,1),%ecx
  xor    (%rax,%rdx,1),%ecx
  mov    %ecx,(%r15,%rdx,1)
  add    $0x4,%rdx
  cmp    $0x28,%rdx
  jne    L84
  mov    %r15,%rdi
  call   <decrypt@plt>
  mov    %rax,%rbp
L12:
  mov    $0x4,%edi
  call   <malloc@plt>
  mov    %rax,%r12
  movzbl (%rbx),%eax
  mov    %r12,%rdi
  mov    %al,(%r12)
  movzbl 0x1(%rbx),%eax
  mov    %al,0x1(%r12)
  movzbl 0x0(%rbp),%eax
  mov    %al,0x2(%r12)
  movzbl 0x1(%rbp),%eax
  mov    %al,0x3(%r12)
  call   <print@plt>
  mov    0x28(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L35
  add    $0x38,%rsp
  mov    %r12,%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L74:
  mov    %r13,%rbx
  jmp    L12
L35:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
char *encrypt_Feistel(char *Msg, char *Key) {
  char Key1[2] = {Key[0], Key[1]};
  char Key2[2] = {Key[1], Key[2]};
  char Key3[2] = {Key[2], Key[3]};
  char Key4[2] = {Key[3], Key[0]};
  char G0[2] = {Msg[0], Msg[1]};
  char D0[2] = {Msg[2], Msg[3]};
  int i;
  int *binaire = malloc(10 * sizeof(int));
  int *binaire1;
  int *binaire2;
  char *tmp_G;
  char *tmp_D;
  char *tmpG;
  ;
  char *tmpD;
  for (i = 0; i < 4; ++i) {
    switch (i) {
    case 0:
      tmp_G = D0;
      binaire1 = encrypt(G0);
      binaire2 = function(tmp_G, Key1);
      int j;
      for (j = 0; j < 10; ++j) {
        binaire[j] = binaire1[j] ^ binaire2[j];
      }
      tmp_D = decrypt(binaire);
      break;
    case 1:
      tmpG = tmp_D;
      binaire1 = encrypt(tmp_G);
      binaire2 = function(tmp_D, Key2);
      int c;
      for (c = 0; c < 10; ++c) {
        binaire[c] = binaire1[c] ^ binaire2[c];
      }
      tmpD = decrypt(binaire);
      break;
    case 2:
      tmp_G = tmpD;
      binaire1 = encrypt(tmpG);
      binaire2 = function(tmp_G, Key3);
      int a;
      for (a = 0; a < 10; ++a) {
        binaire[a] = binaire1[a] ^ binaire2[a];
      }
      tmp_D = decrypt(binaire);
      break;
    case 3:
      tmpG = tmp_D;
      binaire1 = encrypt(tmp_G);
      binaire2 = function(tmp_D, Key4);
      int d;
      for (d = 0; d < 10; ++d) {
        binaire[d] = binaire1[d] ^ binaire2[d];
      }
      tmpD = decrypt(binaire);
      break;
    }
  }
  char *caractere = malloc(4 * sizeof(char));
  caractere[0] = tmpG[0];
  caractere[1] = tmpG[1];
  caractere[2] = tmpD[0];
  caractere[3] = tmpD[1];
  print(caractere);
  return caractere;
}
```