c里面居然没有取子串的函数,这不是给老师出题的机会吗？char * substr(char *string, int start , int end){int len = strlen(string);    if(end > len) {  end = len;}if(start < 0) {  start = len + start;  if(start < 0) {   start = 0;  }}if(end <= 0) {  end = len + end;  if(end < start) {   end = len;  }}if(start > end || start < 0) {  start = 0;}char * substring = (char *) malloc(strlen(string)+1);strncpy(substring, &string[start], end);return substring;}

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