code: def _fft_c2c(a, direction, norm, axes, overwrite_x, plan=None):
      for axis in axes:
          a = _exec_fft(
              a, direction, "C2C", norm, axis, overwrite_x, plan=plan
          )
      return a
  
imports: import functools
  import math
  import numpy
  import cupy
  from cupy.fft import config
  from cupy.fft._cache import get_plan_cache
label_desc: Use image node_id 6 for calling a global function with example usage: _fft_c2c(a, direction, norm, axes, overwrite_x, plan) and returns: a