实现KMP算法

1、构建主串S和子串T,采用定长存储结构实现

2、编写主程序调用KMP算法，测试不同的输入数据S和T，输出的结果（输出模式串T的next值，以及T在S中的定位函数值。-KMP algorithm 1 to construct the main string S and substring T, using fixed-length storage structure 2, the preparation of the main program calls the KMP algorithm, the next value of the test input data S and T, the output of the results (output mode string T, and T in S positioning function value.