1790. Check if One String Swap Can Make Strings Equal

bool areAlmostEqual(char* s1, char* s2) {
    char* a = s1;
    char* b = s2; 
    int c = 0;
    char p[2];
    char o[2];

    if(strlen(s1) != strlen(s2)) return false;
    
    while( *a != '\0' && *b != '\0')
    {
        if(*a != *b)
        {
            c++;
            if(c > 2 ) return false;
            p[c - 1] = *b;
            o[c - 1] = b - s2;
        }
        a++; b++;
    }

    if(c == 0) return true;
    if(c == 1) return false;
    if(c == 2){
        b = s2;
        while(*b != '\0' )
        {
            if((b - s2) == o[0])
            {
                *b = p[1];
            }
            if((b - s2) == o[1])
            {
                *b = p[0];
            }
            b++;
        }
    a = s1; b = s2;
        while( *a != '\0' && *b != '\0')
        {
            if(*a != *b)
            {
                return false;
            }
            a++; b++;
        }
    }
return true;
}