本代码实现 Cooley-Tukey 蝶形算法计算复数域的一维快速傅里叶变换。非迭代方式，节约内存，执行速度快。要求数据个数为2的整幂次方，符合语法规范，可直接使用。
如下代码及示范数据，输出为：
(363.000000000000,0.000000000000000E+000)
(-52.9411231676211,-65.4558436870575)
(-15.0000000874228,2.00000000000000)
(14.9411242803314,14.5441577965562)
(31.0000000000000,0.000000000000000E+000)
(14.9411266645322,-14.5441563129425)
(-14.9999999125772,-2.00000000000000)
(-52.9411277772425,65.4558422034438)
(36.0000000000000,0.000000000000000E+000)
(21.0000007843665,-4.589695601353583E-
