Reverse the string value till last vowel

Reverse the string value till last vowel
Given a string S, the program must reverse the string till last vowel. (All alphabets will be in smaller case and there will be no space within the string S).

Input Format:
The first line contains S.

Output Format:
The first line contains the string value reversed till last vowel

Boundary Conditions:
2 <= Length of S <= 100

Example Input/Output 1:
Input:
manager

Output:
eganamr

Explanation:
The last vowel is e. Hence manage is reversed and r is retained as such.

#include<stdio.h>
#include <stdlib.h>
int main()
{
char s[100];
scanf("%s",s);
int index = 0,i=0,j=0;
for(i=strlen(s)-1;i>=0;i--)
{
    if(s[i]=='a' || s[i]=='e' || s[i]=='i' || s[i]=='o' || s[i]=='u')
    {
        index = i;
        break;
    }
}
//printf("%d", index);
for(i=index;i>=0;i--)
printf("%c",s[i]);
for(j=index+1;j<strlen(s);j++)
printf("%c",s[j]);
}