[leetcode]-796. Rotate String

We are given two strings, A and B.

A shift on A consists of taking string A and moving the leftmost character to the rightmost position. For example, if A = 'abcde', then it will be 'bcdea' after one shift on A. Return True if and only if A can become B after some number of shifts on A.

Example 1:
Input: A = 'abcde', B = 'cdeab'
Output: true

Example 2:
Input: A = 'abcde', B = 'abced'
Output: false

Note:

• A and B will have length at most 100.

bool rotateString(char* A, char* B) {
    int a,b;
    a=strlen(A);
    b=strlen(B);
    int i,j,k;
    char t;
    if(a!=b)
        return false;
    if(a==0)
        return true;
    for(i=0;i<a;i++)
    {
        t=A[a-1];
        for(k=a-1;k>0;k--)
        {
            A[k]=A[k-1];
        }
        A[0]=t;
        if(strcmp(A,B)==0)
            return true;
    }
    return false;
}