C StrStr findStr m1o2 biggest string in string

#include <stdio.h>
#include <stdlib.h>

#define STR_MAX_LENGTH 50


void findStr( const char *first, const char *second, char *buffer ){

    int startIndex = -1;
    int length = -1;

    int firstIndex, secondIndex;

    for( firstIndex = 0; *( first + firstIndex ); ++firstIndex ){

        for( secondIndex = 0; *( second + secondIndex ); ++secondIndex ){

            if( *( first + firstIndex ) == *( second + secondIndex ) ){

                int currentFirstIndex = firstIndex, currentSecondIndex = secondIndex;
                int currentLength = 0;

                for( ; *( first + currentFirstIndex ) && *( second + currentSecondIndex ) && *(first + currentFirstIndex ) == *( second + currentSecondIndex ); ++currentFirstIndex, ++currentSecondIndex, ++currentLength )
                    ;

                if( currentLength > length ){

                    length = currentLength;
                    startIndex = firstIndex;
                }
            }
        }
    }

    if( length > 0 ){

        int index;
        for( index = 0; length--; ++index )
            buffer[ index ] = *( first + startIndex++ );

        buffer[index] = '\0';
    }
}

int main( int argsLength, char *argv[] ){

    char first[] = "abbcccddddfffffddddccccbbaa", second[] = "fffff", buffer[STR_MAX_LENGTH] = {0};

    findStr( first, second, buffer );

    printf("\n\nfirst = %s, second = %s, result = %s\n\n", first, second, buffer );

    return 0;
}