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nucleotide.c

#include <stdio.h>

void print_pairs(const char *nucleotides, int len) 
{
    int count = 0;
    for (int i = 0; i < len; ++i) {
        if (nucleotides[i] == nucleotides[i + 1]) {
            count += 1;
            printf("%c%c\n", nucleotides[i], nucleotides[i]);
        }
    }
    printf("%i consecutive nucleobases\n", count);
}

int main() 
{
    char nucleotides[1000];
    int len;
    scanf("%d", &len);
    scanf("%s", nucleotides);
    print_pairs(nucleotides, len);
    return 0;
}