findString.c

#include <stdio.h>
#include <string.h>
int findString(char source1[], char source2[]);

int main()
{
    char x[] = "a chatterbox";

    char y[] = "hat";

    int z = findString(x, y);

    printf("%d\n", z);

    return 0;
}

int findString(char source1[], char source2[])
{
    int flag = 1;

    int i = 0;
    int j = 0;
    int counter = 0;

    while(source1[i] != '\0' && j < strlen(source2))
    {
        if(flag == 1)
        {
            if(source1[i] == source2[j])
            {
                flag = 1;
                i++;
                j++;
            }
            else
            {
                flag = 0;
                j = 0;
            }
        }
        else
        {
            if(source1[i] == source2[j])
            {
                flag = 1;
                counter = i;
            }
            else
            {
                i++;
            }
        }
    }
    if(flag == 1)
    {
        return counter;
    }
    else
        return -1;

}