"C language" left-handed string

Implement a function that can be left-handed in the string of K-character method one: Open another array, first write the character after k+1 to the array, and then write the K-character to the left to achieve the following: #include <stdio.h> #include < assert.h> #include <string.h>void left_relvove (char *str,char *arr,int k) {Char  *pcur = str+k;     //let the pointer begin with the K+1 character and save it in the ARR array      assert  (Str && arr);         //assert while (*pcur)             //starts with the k+1 character and encounters a ' \ ' jump out {*arr++ =  *pcur++;   }pcur = str;  //after writing the character after k+1 to arr, move the pointer to the first element of STR, Start writing the k character to rotate while (k) {*arr++ = *pcur++;k--;} *arr= ' + ';} Int main () {    int k;    char str[10] = {0}; &NBSP;&NBSP;&NBSP;&NBSP;CHAR&NBSP;ARR[10]&NBSP;=&NBSP;{0};&NBSP;&NBSP;&NBSP;&NBSP;SCANF ("%d",  &k); scanf ("%s", str);     left_relvove (str,arr,k); &NBSP;&NBSP;&NBSP;&NBSP;PRintf ("%s\n", arr);     return 0;} Method Two: Define a string rollover function, the left-handed K-word Mr. Foo reverse reversal, and then the k+1 after the reverse reversal of the character, and finally the entire string reversed reverse implementation as follows: #include <stdio.h> #include  < String.h>void reserve (char *left,char*right)  {    while  (left  < right)     {        char tmp =  *left;        *left = *right;         *right = tmp;        left++;         right--;    }}int main () {     char arr[10] =  "AABCD";      int len = strlen (arr) -1;    int k = 0;    char *pstart =  &arr[0];    char *pend = arr+len; &NBSP;&NBSP;&NBSP;SCANF ("%d",  &k);     reserve (pstart, pstart + k &NBSP;-1);  //to the left-handed K word Mr. Foo reverse reversal     reserve (pstart + k, pend);       //k+1 The characters after the reverse     reserve (pstart, pend);           //the entire string reversed reverse     printf ("%s\n",  arr);     system ("pause");     return 0;}

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"C language" left-handed string