Hacker Rank: Alternating Characters

#import <Foundation/Foundation.h>


int deletionsRequiredForString (char buffer[], int length) {
    
    int deletions = 0;
    
    if (length > 1) {
        
        char previousChar = buffer[0];
        
        for (int i = 1; i < length; i ++) {
            char currentChar = buffer[i];
            if (currentChar == previousChar) {
                deletions++;
            } else {
                previousChar = currentChar;
            }
        }
    }
    
    return deletions;
}



int main (int argc, const char * argv[]) {

    int numberOfWords;
    
    scanf("%d", &numberOfWords);
    
    char buffer[100000];
    
    for (NSInteger i = 0; i < numberOfWords; i ++){
        
        int length = 0;
        
        scanf("%100000s%n",buffer,&length);
        
        printf("%d\n", deletionsRequiredForString(buffer,length));
        
    }
    
    return 0;
    
}