C-language Inverse string array

Problem Description: The contents of a character array are: "Student a Am I", please change the contents of the array to "I am a student".

Code implementation:

 #include  <stdio.h>void swap (char *a,char *b) {  *a = *a + *b; *b = *a - *b; *a = *a -  *b;} Void reverse (char *arr,int left,int right)//student a am i{ while (left  < right)  {  swap (&arr[left],&arr[right]);//arr[0]  left++;   right--; }}int main () { int left = 0; int right =  0; char arr[]= "Student a am i";  reverse (arr,0,sizeof (arr)/sizeof (arr[0])-2 );//student\0  while (arr[right] !=  ')  { while (arr[right] !=  ') &&arr[right] !=  '   ')  { right++; } right--; reverse (Arr,left, right);  left = right+2; right = left; } printf ("%s\n", arr);  return 0;} 

The result is:

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C-language Inverse string array