user: Translate the below assembly code into C programming language:

```asm
<vp8cx_horizontal_line_4_5_scale_c>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x28(%rbp)
  mov    %esi,-0x2c(%rbp)
  mov    %rdx,-0x38(%rbp)
  mov    %ecx,-0x30(%rbp)
  mov    -0x38(%rbp),%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x28(%rbp),%rax
  mov    %rax,-0x8(%rbp)
  movl   $0x0,-0x20(%rbp)
  jmp    L5
L0:
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  mov    %eax,-0x1c(%rbp)
  mov    -0x8(%rbp),%rax
  add    $0x1,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  mov    %eax,-0x18(%rbp)
  mov    -0x1c(%rbp),%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  mov    %dl,(%rax)
  mov    -0x1c(%rbp),%eax
  imul   $0x33,%eax,%edx
  mov    -0x18(%rbp),%eax
  imul   $0xcd,%eax,%eax
  add    %edx,%eax
  sub    $0xffffff80,%eax
  shr    $0x8,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  add    $0x1,%rax
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rax
  add    $0x2,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  imul   $0x9a,%eax,%eax
  mov    %eax,-0x14(%rbp)
  mov    -0x8(%rbp),%rax
  add    $0x3,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  mov    %eax,-0x1c(%rbp)
  mov    -0x18(%rbp),%eax
  imul   $0x66,%eax,%edx
  mov    -0x14(%rbp),%eax
  add    %edx,%eax
  sub    $0xffffff80,%eax
  shr    $0x8,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  add    $0x2,%rax
  mov    %dl,(%rax)
  mov    -0x1c(%rbp),%eax
  imul   $0x66,%eax,%edx
  mov    -0x14(%rbp),%eax
  add    %edx,%eax
  sub    $0xffffff80,%eax
  shr    $0x8,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  add    $0x3,%rax
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rax
  add    $0x4,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  mov    %eax,-0x18(%rbp)
  mov    -0x1c(%rbp),%eax
  imul   $0xcd,%eax,%edx
  mov    -0x18(%rbp),%eax
  imul   $0x33,%eax,%eax
  add    %edx,%eax
  sub    $0xffffff80,%eax
  shr    $0x8,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  add    $0x4,%rax
  mov    %dl,(%rax)
  addq   $0x4,-0x8(%rbp)
  addq   $0x5,-0x10(%rbp)
  addl   $0x4,-0x20(%rbp)
L5:
  mov    -0x2c(%rbp),%eax
  sub    $0x4,%eax
  cmp    %eax,-0x20(%rbp)
  jb     L0
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  mov    %eax,-0x1c(%rbp)
  mov    -0x8(%rbp),%rax
  add    $0x1,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  mov    %eax,-0x18(%rbp)
  mov    -0x1c(%rbp),%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  mov    %dl,(%rax)
  mov    -0x1c(%rbp),%eax
  imul   $0x33,%eax,%edx
  mov    -0x18(%rbp),%eax
  imul   $0xcd,%eax,%eax
  add    %edx,%eax
  sub    $0xffffff80,%eax
  shr    $0x8,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  add    $0x1,%rax
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rax
  add    $0x2,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  imul   $0x9a,%eax,%eax
  mov    %eax,-0x14(%rbp)
  mov    -0x8(%rbp),%rax
  add    $0x3,%rax
  movzbl (%rax),%eax
  movzbl %al,%eax
  mov    %eax,-0x1c(%rbp)
  mov    -0x18(%rbp),%eax
  imul   $0x66,%eax,%edx
  mov    -0x14(%rbp),%eax
  add    %edx,%eax
  sub    $0xffffff80,%eax
  shr    $0x8,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  add    $0x2,%rax
  mov    %dl,(%rax)
  mov    -0x1c(%rbp),%eax
  imul   $0x66,%eax,%edx
  mov    -0x14(%rbp),%eax
  add    %edx,%eax
  sub    $0xffffff80,%eax
  shr    $0x8,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  add    $0x3,%rax
  mov    %dl,(%rax)
  mov    -0x10(%rbp),%rax
  add    $0x4,%rax
  mov    -0x1c(%rbp),%edx
  mov    %dl,(%rax)
  nop
  pop    %rbp
  ret
```

assistant: ```c
void vp8cx_horizontal_line_4_5_scale_c(const unsigned char *source, unsigned int source_width, unsigned char *dest, unsigned int dest_width) {
  unsigned i;
  unsigned int a, b, c;
  unsigned char *des = dest;
  const unsigned char *src = source;
  (void)dest_width;
  for (i = 0; i < source_width - 4; i += 4) {
    a = src[0];
    b = src[1];
    des[0] = (unsigned char)a;
    des[1] = (unsigned char)((a * 51 + 205 * b + 128) >> 8);
    c = src[2] * 154;
    a = src[3];
    des[2] = (unsigned char)((b * 102 + c + 128) >> 8);
    des[3] = (unsigned char)((c + 102 * a + 128) >> 8);
    b = src[4];
    des[4] = (unsigned char)((a * 205 + 51 * b + 128) >> 8);
    src += 4;
    des += 5;
  }
  a = src[0];
  b = src[1];
  des[0] = (unsigned char)(a);
  des[1] = (unsigned char)((a * 51 + 205 * b + 128) >> 8);
  c = src[2] * 154;
  a = src[3];
  des[2] = (unsigned char)((b * 102 + c + 128) >> 8);
  des[3] = (unsigned char)((c + 102 * a + 128) >> 8);
  des[4] = (unsigned char)(a);
}
```