Keep only base/extractor.[cc|h].

third_party/lzma/v4_65/files/CPP/Common/IntToString.cpp

-// Common/IntToString.cpp
-
-#include "StdAfx.h"
-
-#include "IntToString.h"
-
-void ConvertUInt64ToString(UInt64 value, char *s, UInt32 base)
-{
-  if (base < 2 || base > 36)
-  {
-    *s = '\0';
-    return;
-  }
-  char temp[72];
-  int pos = 0;
-  do
-  {
-    int delta = (int)(value % base);
-    temp[pos++] = (char)((delta < 10) ? ('0' + delta) : ('a' + (delta - 10)));
-    value /= base;
-  }
-  while (value != 0);
-  do
-    *s++ = temp[--pos];
-  while (pos > 0);
-  *s = '\0';
-}
-
-void ConvertUInt64ToString(UInt64 value, wchar_t *s)
-{
-  wchar_t temp[32];
-  int pos = 0;
-  do
-  {
-    temp[pos++] = (wchar_t)(L'0' + (int)(value % 10));
-    value /= 10;
-  }
-  while (value != 0);
-  do
-    *s++ = temp[--pos];
-  while (pos > 0);
-  *s = L'\0';
-}
-
-void ConvertInt64ToString(Int64 value, char *s)
-{
-  if (value < 0)
-  {
-    *s++ = '-';
-    value = -value;
-  }
-  ConvertUInt64ToString(value, s);
-}
-
-void ConvertInt64ToString(Int64 value, wchar_t *s)
-{
-  if (value < 0)
-  {
-    *s++ = L'-';
-    value = -value;
-  }
-  ConvertUInt64ToString(value, s);
-}